The strategy of playing in freerolls changes quite a bit than playing in regular tournaments, simply because it is a freeroll.

The main thing is you have to be extra patient...patience, patience, patience. Unless you are short stacked, you need to wait for good hands pre-flop, or strong limping hands such as low pocket pairs looking for that set, or something like J10 suited, but with a raise in front of you, you should let that go unless you got good pot odds.

In poker freerolls, people tend to make irrational decisions simply because it is a freeroll, a lot of people over play hands and think hands are a lot better than they really are, like AK. I found through experience that limping/raising with hands like KJ, Q10, J9, etc. get me into lots of trouble. This being that even if you do flop top pair, you have weak kickers, you will be beaten by hands like AQ, A10, AJ, decent hands. And being that in freerolls, people play more random hands like I mentioned, giving you more chances to get outdrawn. So, never slow play, never, never, never. If you get AA in the SB, and everyone folds to you, do NOT just limp, you are giving 2 rags a chance to get a good draw, 2 pair, etc. just take the blind.
Winning small is better than losing big.

People tend to chase draws a lot more, even gut shot draws, because it is a freeroll and there is 'nothing to lose', so if you have 55 and flop is Js 10s 5c, bet, bet, bet, no way can you slow play that with 2 spades and the J10 out there, you should never let anyone have a chance to hit a draw for free.

I have won 2 HORSE limit 2400 person freerolls at full tilt this past october because of staying patient, knowing when im beat, and thriving durnig omaha and razz, because i understand those games, I can take advantage of those who don't play it, so if you know those games, HORSE is a good choice for you, assuming you know hold'em and stud is easy to figure out. I'll take the extra $30.

All this doesn't mean that you shouldn't play tight, tight-aggressive, however you like in real money, because there are always people who play loose, so take advantage of them, when you hit, play extra aggressive to steal the pot or win big (or lose big =/ )

Just my findings through experience of a former freeroller who made a bankroll of $100+ by sticking to these rules.