early freeroll, i would play your position, utg AA or KK if you won't go allin with it don't even play it in a freeroll. middle position i would muck most everything until you get a feel for the table add AK AQSs QQ JJ. late now here is where you play "loose" true suited connectors, not that one gap crap, any small pairs, suited aces.
if you are playing from position in following rounds you not only get to see what happens before you, but more often than not there will be a "hero" player wanting to go all in with top pair weak kicker, or two pair when you hold the nutz.
only other thing is do not bluff, these first round players either don't have the skill or don't really care if they don't have odds
, save all that fancy stuff for deep in the tourney when the blinds are so high, you just might have to steal a few blinds just to stay ahead of the field to get itm.
early play few hands out of position, play on the button or near it, don't call alot of preflop raises unless you are getting wicked odds. don't bother bluffing people who don't know what they are doing. have patience.