I play a 45 man freeroll tournament. At the start of the tournament I am very tight in early position. I raise 5x bb with premium hands in early since most of the time you raise will not get respect early in the tourney or because players just want to see more flops before blinds get raised. Always c bet at least 2/3 of pot, if someone hit they will chase, others will chase for pot odds
in late position. If you are going to be tight, be aggressive when you get big hands. In late position I limp in with marginal hands and try to hit set, flush, straight- postflop I will be in position to call pot odds
if early position players slow play big hands. Don't go broke with one pair, even if they bluff just wait for a better spot. Protect your stack. Pay attention to the players at your table, if you are paying for the tourney you have to do the work.