Don't put your whole stack in the middle early on unless you are sure that you're ahead pre-flop, such as holding AA. It's also not worth the risk trying to steal blinds with marginal hands because the blinds are so low and people call with anything. There will constantly be people who grab a huge lead in the first hour playing like maniacs with VPIP's of 70+, but these types usually flame out soon. I remember reading recently that the chip leader at the end of day 1 of the WSOP Main Event has never made it to the final table.
There are many more possible combination of crap hands than premium ones, so don't be surprised if you might have to wait a while to get anything even remotely playable.
I feel like something very important should be said... You should always think about it twice before you put your whole stack in the middle (early or not!) I made the mistake playing a $30 Buy in today live.
An early position player made an all-in shove that folded to me with AJo...
I thought what a great chance to add to my stack let me call his all in move here because he could be shoving such a wide range not wanting the blinds to rob him of his stack. I knew it was heads up so I slid everything in and lo and behold the dreaded fool had pocket Aces. The truth is, I regret the call because I was not even willing to flip at that point... baad bad decision, even with AJ
Just because a player looks like he may be weak doesn't mean that he is. Just because you expect that early position player to shove, doesn't mean you should call! There are a lot of factors to consider, even in the middle-late stages when you WANT to take chances, WANT to collect a lot of chips. I lost almost half my stack doubling up that gonad and despite my better efforts I got blinded out of the tourney.