In David Sklansky's book, "Tournament Poker for Advance Players" he describe a system where a player either goes all in or folds.

1. If an opponent raises, go all in if you have pocket aces or kings or ace kings suited, otherwise fold.

2. If no one raises in front of you, go all in with any suited connector that is larger than four three, any pair, any ace suited and Ace king suited/unsuited.

That's it.

 

I modified it a bit.  My strategy says go all in with these cards and fold the rest:

AK,AA,KK,QQ,AQ,JJ,TT,99,88,AJ

This works especially well in the freeroll.

This will get you in the money but not at the final table. I will talk more on how to get to the final table.