Thank you very much.
Openings for a 1100

rating should be of no concern among those well read enough in theory because we're not chess masters yet so with that said the 1.B4 is pretty good and is occasionally seen at master level..btw fischer had it under his belt and used it at least once🇺🇸👍

Check out this article: http://chesswinning.com/10-best-chess-openings/
You can study these openings with some of these books: http://chesswinning.com/7-best-chess-books/

When I coached a high school chess team, with a lot of 1100 players, I chose openings that led to easy to plan middlegame attacks.
For White we played 1 e4 and vs 1...e5 we played the Bishop's Opening, 2 Bc4, 3 d3, then usually 4 Nc3 and 5 f4. You will try to castle O-O-O and launch a Pawn Storm on the King-side.
For 1 e4 e6 and 1 e4 c6 we played Advance Variations and against the Sicilian we might play 2 c3 to avoid theory if we thought Black was a variations memorizer.
As Black the related Slav and Caro-Kann Defenses are good to use because the setup is straightforward: Pawns on c6 and d5, move your c8-B to f5 or g4 if possible, then c6, Nbd7, Nf3 and you are ready to play ...c5 and begin a Queenside attack.

What openings would you recommend for a 1100? I play too much of e4. Is the Slav Defense a good opening? Thanks.
bro i am here to help u seriously like an blind helping another blind. any opening played in world champ matches u can play any level of chess . just download few games and keep reading as hobbyist chess reader and keep playing.
"... A typical way of choosing an opening repertoire is to copy the openings used by a player one admires. ... However, what is good at world-championship level is not always the best choice at lower levels of play, and it is often a good idea to choose a 'model' who is nearer your own playing strength. ..." - FM Steve Giddins (2008)

What openings would you recommend for a 1100? I play too much of e4. Is the Slav Defense a good opening? Thanks.
Follow Opening Principles:
Control the center.
Develop towards the center.
Castle.
Connect your rooks.
Its generally considered good advce for beginners to play "Open" games. So first moves like 1.e4, 1...e5 are a good choice. With black, the Queens Gambit Declined is also a good choice.

What books do you recommend for the Nimzo Indian-Larsen attack?
pokemon books are perfect theoretical.

So much bumf has been written about openings it almost begs belief. All we are attempting to do is establish control of at least one central complex (either light squared - e4 and d5 or dark squared - d4 and e5) and to undermine our opponents control of a central complex. In this example its self evident that white is attempting to maintain control of the central complex e4 and d5 (the light squares) and undermine blacks control of the central complex d4 and e5 (the dark squares)
For someone seeking help with choosing openings, I usually bring up Openings for Amateurs by Pete Tamburro (2014).
http://kenilworthian.blogspot.com/2014/05/review-of-pete-tamburros-openings-for.html
https://chessbookreviews.wordpress.com/tag/openings-for-amateurs/
I believe that it is possible to see a fair portion of the beginning of Tamburro's book by going to the Mongoose Press site.
https://www.mongoosepress.com/catalog/excerpts/openings_amateurs.pdf
Perhaps mbereobong would also want to look at Discovering Chess Openings by GM John Emms (2006).
"... For beginning players, [Discovering Chess Openings] will offer an opportunity to start out on the right foot and really get a feel for what is happening on the board. ..." - FM Carsten Hansen (2006)
https://web.archive.org/web/20140627114655/http://www.chesscafe.com/text/hansen91.pdf
"There is no such thing as a 'best opening.' Each player should choose an opening that attracts him. Some players are looking for a gambit as White, others for Black gambits. Many players that are starting out (or have bad memories) want to avoid mainstream systems, others want dynamic openings, and others want calm positional pathways. It’s all about personal taste and personal need.
For example, if you feel you’re poor at tactics you can choose a quiet positional opening (trying to hide from your weakness and just play chess), or seek more dynamic openings that engender lots of tactics and sacrifices (this might lead to more losses but, over time, will improve your tactical skills and make you stronger)." - IM Jeremy Silman (January 28, 2016)
https://www.chess.com/article/view/opening-questions-and-a-dream-mate
https://www.chess.com/article/view/picking-the-correct-opening-repertoire
http://chess-teacher.com/best-chess-openings/
https://www.chess.com/blog/TigerLilov/build-your-opening-repertoire
https://www.chess.com/blog/CraiggoryC/how-to-build-an-opening-repertoire
https://www.chess.com/article/view/learning-an-opening-to-memorize-or-understand
https://www.chess.com/article/view/the-perfect-opening-for-the-lazy-student
https://www.chess.com/article/view/3-ways-to-learn-new-openings
https://www.chess.com/article/view/how-to-understand-openings
https://www.newinchess.com/media/wysiwyg/product_pdf/9035.pdf
https://web.archive.org/web/20140627110453/http://www.chesscafe.com/text/hansen169.pdf
https://www.newinchess.com/media/wysiwyg/product_pdf/9029.pdf
https://www.chess.com/article/view/has-the-king-s-indian-attack-been-forgotten
https://www.newinchess.com/media/wysiwyg/product_pdf/7277.pdf
https://www.newinchess.com/media/wysiwyg/product_pdf/9033.pdf
https://www.newinchess.com/media/wysiwyg/product_pdf/9050.pdf
https://web.archive.org/web/20140627104938/http://www.chesscafe.com/text/hansen159.pdf
https://web.archive.org/web/20140627022042/http://www.chesscafe.com/text/hansen153.pdf
https://web.archive.org/web/20140627132508/http://www.chesscafe.com/text/hansen173.pdf
"... Overall, I would advise most players to stick to a fairly limited range of openings, and not to worry about learning too much by heart. ..." - FM Steve Giddins (2008)
"... Once you identify an opening you really like and wish to learn in more depth, then should you pick up a book on a particular opening or variation. Start with ones that explain the opening variations and are not just meant for advanced players. ..." - Dan Heisman (2001)
https://web.archive.org/web/20140626180930/http://www.chesscafe.com/text/heisman06.pdf
"... To begin with, only study the main lines ... you can easily fill in the unusual lines later. ..." - GM John Nunn (2006)
"... I feel that the main reasons to buy an opening book are to give a good overview of the opening, and to explain general plans and ideas. ..." - GM John Nunn (2006)
"... If the book contains illustrative games, it is worth playing these over first ..." - GM John Nunn (2006)
"... the average player only needs to know a limited amount about the openings he plays. Providing he understands the main aims of the opening, a few typical plans and a handful of basic variations, that is enough. ..." - FM Steve Giddins (2008)
"... For inexperienced players, I think the model that bases opening discussions on more or less complete games that are fully annotated, though with a main focus on the opening and early middlegame, is the ideal. ..." - FM Carsten Hansen (2010)
"... Everyman Chess has started a new series aimed at those who want to understand the basics of an opening, i.e., the not-yet-so-strong players. ... I imagine [there] will be a long series based on the premise of bringing the basic ideas of an opening to the reader through plenty of introductory text, game annotations, hints, plans and much more. ..." - FM Carsten Hansen (2002)
https://web.archive.org/web/20140627055734/http://www.chesscafe.com/text/hansen38.pdf
"The way I suggest you study this book is to play through the main games once, relatively quickly, and then start playing the variation in actual games. Playing an opening in real games is of vital importance - without this kind of live practice it is impossible to get a 'feel' for the kind of game it leads to. There is time enough later for involvement with the details, after playing your games it is good to look up the line." - GM Nigel Davies (2005)