How to play tourny given setup...

[RIDGE45]

I play a live $35 tourny at a local card room, and I have a question about how I should approach this tourny given the setup.

Its 5 tables of 10 players. Each player starts with 4,000 in chips. Blinds start at 50-100 and increase every 12 minutes (100-200, 200-400, 400-800, 1,000-2,000, etc). So, they start to get really big, pretty fast. Top 5 pay.

At what point (stack xBB) should I be the point of pushing any two in LP/CO with folds to me? What hands should I consider to be a push once I have less than 10xBB.

In the beginning should I be trying to do a lot of stealing and gambling with possible coinflips b/c of the blind/payout structure.

Basically, should I playing to get a stack, since it is almost futile to sit and wait considering the structure?

Thanks guys.