It all depends on the game. If youre in a bingo freeroll... (Any large freeroll with quick blinds) forget bluffing
in the early going. Instead overbet every good hand you get. I'm willing to flip early for my tournament life because:
A. Its a large freeroll.
B. I'm going to have to accumulate a lot of chips to have a chance at a good run.
C. The blinds will increase too fast for me to not take chances.
D. The kinds of hands that are calling me are much weaker than in a stronger field.
Once youre talking about money tournaments that arent 5 dollars or less and arent turbos... you can slow down a bit. You can actually play some poker. Tight Aggressive Poker.
And just because you play tight at a short handed table, doesnt mean that you dont have to adjust for a full table MTT. What you're going to open UTG with when there are six hands, are not the kind of hands you are going to open UTG at a full table.
Another difference from your short handed cash games, is that you're going to feel the blinds pushing you. You're going to have to adjust to this and loosen up, and play more like you would at the short handed tables. Eventually you're going to be doing the math of whether its a good idea to push or even call an all in hand with hands you would have mucked easily a few hours earlier.
Im sure there are tons of articles like the ones above that can teach you much more... but this is my two cents.