King's Indian Attack

Anyone know what are the best moves after the 6 moves of King's Indian Attack are done?? 

depends on the variation. post a chess game and I'll see what I can find out

yeah, you really shouldn't worry too much about about openings until you are 1800 or higher. I look at them some, but really I just focus on theory, and how it applies to the one opening I am trying to master. The opening I am working on is on of the top three most commonly played by masters, so no worries there, I just have to concentrate on learning the theory behind it. Read Jeremy Silman's "How to Reassess Your Chess." It teaches you how to develop a plan, and how to set about working it out.

As long as you have a basic understandinf of piece placement, and pawn structure, youre on the right track.

https://www.chess.com/article/view/has-the-king-s-indian-attack-been-forgotten
The King's Indian Attack is sometimes suggested as a sort of quick-fix opening solution for near-beginners, but notice the reservations that IM Watson had while mentioning the idea.
"... For players with very limited experience, I recommend using openings in which the play can be clarified at an early stage, often with a degree of simplification. To accomplish this safely will take a little study, because you will have to get used to playing wiith open lines for both sides' pieces, but you can't eliminate risk entirely in the opening anyway. ... teachers all over the world suggest that inexperienced players begin with 1 e4. ... You will undoubtedly see the reply 1 ... e5 most often when playing at or near a beginner's level, ... After 2 Nf3, 2 ... Nc6 will occur in the bulk of your games. ... I recommend taking up the classical and instructive move 3 Bc4 at an early stage. Then, against 3 ... Bc5, it's thematic to try to establish the ideal centre by 4 c3 and 5 d4; after that, things can get complicated enough that you need to take a look at some theory and learn the basics; ... Of course, you can also play 1 d4 ... A solid and more-or-less universal set-up is 2 Nf3 and 3 Bf4, followed in most cases by 4 e3, 5 Be2 and 6 0-0. I'd rather see my students fight their way through open positions instead; however, if you're not getting out of the opening alive after 1 e4, this method of playing 1 d4 deserves consideration. ... a commonly suggested 'easy' repertoire for White with 1 Nf3 and the King's indian Attack ... doesn't lead to an open game or one with a clear plan for White. Furthermore, it encourages mechanical play. Similarly, teachers sometimes recommend the Colle System ..., which can also be played too automatically, and usually doesn't lead to an open position. For true beginners, the King's Indian Attack and Colle System have the benefit of offering a safe position that nearly guarantees passage to some kind of playable middlegame; they may be a reasonable alternative if other openings are too intimidating. But having gained even a small amount of experience, you really should switch to more open and less automatic play." - IM John Watson in a section of his 2010 book, Mastering the Chess Openings, Volume 4
The KIA is discussed in Winning Chess Openings by GM Yasser Seirawan (1999).
https://web.archive.org/web/20140627132508/http://www.chesscafe.com/text/hansen173.pdf
For more on the KIA, one could try The King's Indian Attack: Move by Move by Grandmaster Neil McDonald (2014).
https://www.newinchess.com/media/wysiwyg/product_pdf/7277.pdf
Perhaps, it would be of interest to look at The Fianchetto Solution by Emmanuel Neiman and Samy Shoker (2016)
https://www.newinchess.com/media/wysiwyg/product_pdf/9029.pdf
and Starting Out: King's Indian Attack by John Emms (2005).
https://web.archive.org/web/20140627034051/http://www.chesscafe.com/text/hansen81.pdf

"... 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)

"How to Reassess Your Chess, 4th Edition was designed for players in the 1400 to 2100 range." - IM Jeremy Silman (2010)

Congratulations!

Glad to help.