Hey Steven,
it sounds like you may be getting ahead of yourself. Can you do all of the 2 add moves? I would suggest that you school the crap out of the basic 2 add moves before you begin trying moves like osis and spins. They are a general foundation on which you can base more advanced moves that you will learn later.
These moves are, Around the World (both directions), mirage and illusion, legover and pickup, downtime pixie and fairy, clipper, etc. Look in the Trick Tips forum for advice on these moves, as well as video demonstrations.
Master these moves and I think you will begin to understand how open freestyle is and what paths you can choose to develop your own arsenal of moves, and your personal style.
The best advice I think that anybody, and most would give you would be to
LEARN EVERYTHING BOTH SIDES. Just remember that and when you are learning a new move make sure that you learn it with both legs/on both sides of your body. This is cruuuuucial.
Best of luck.
PS: please read the intial post in this thread:
http://www.modified.in/footbag/viewtopic.php?t=2963