Studying Master Games

I have CB12 with the megadatabase.  I'm getting into the habit of studying at least a few games every day but I'm running into a problem.  Is there a way to mark what games I've already looked at and filter them out? 

If not, is there a clever workaround?  Maybe another application I could use to review and mark the games I've looked at?

Also, it seems like there are ton's of things that can be done with chessbase that I'm not even aware of.  Any idea's on a book/website/video that offers a good overview of how to use it?  I'm not looking for the manual, but ideas for how to put the data to use.

And finally.  Is there a good source for finding who to study?  Say I want to work on endgames.  I know there are GM's who are better than others as far as learning from them.  Same thing with positional play or the Kings Indian Defense.  Is there a list somewhere with famous players and brief descriptions of their playing style?

Thanks for any help.

this guy has lots of vids showing how to use cdase

http://www.youtube.com/watch?v=es27A5tGSLY

Simple. Just make a database for the games you have already looked at.

Even better, if you really want to improve, annotate them yourself in your new database (don't do this in the original database since it can't be undone!) and examine your annotations with Houdini, Komodo, or Stockfish.

For endgames, you could start with Capablanca : you can't go too much wrong here

He is fine for positional play as well.

For KID defence, I would recommend looking at games of David Bronstein, Gligoric, Leonid Stein, Efim Geller and among recent masters Fischer, Kasparov and Radjabov (but start with the old masters).

I agree with everything here, I would just add to this list:

Rubinstein for endgames,

Karpov (especially games from the 1990s) for positional play,

Boleslavsky for the KID.

Thanks for the tips, I really apreciate it.  Omargalanti, I'd love to see if.  Thanks.