New to MTT

[Dell 55]

I am a successful ring player but am fairly new to MTT. I have a couple of basic questions and would appreciate any response.

1. With Poker Stars FPP what is the best way to use them to try and get started with MTT?

2. What is the recommended bankroll for $20 MTT?

3. Is there any strategy adjustments when tournament has 200 entrants versus 2000 entrants?

thanks for all replies