re: Poker & hand selection in sit n gos
thunder is giving you pefect advice IMO.
Play super tight for the first few orbits, from whatever position, just to gauge what you opponents are like eg rocks, fish, whales (massive fish) etc.
Your HUD should also help you with this.
Once you have a few orbits you can open up your hand range in Late Position, but not stupid hands like KTo that are easily dominated but hard to get rid of post-flop.
Being at 1.2k with 50/100 blinds isn't terrible, and with a super tight image your shoves to steal should work for the first few times unless you run into a monster, or a donkey who hasn't been paying attention (likely).
Don't shove over the top of someone unless you have a massive hand. You have little fold equity (900 more for them to call) and they most likely have a hand they like (or they wouldn't have raised).
Open shoving is almost always better than shoving over the top of a raise.
Once the blinds raise again and stacks are about equal, you need to play good bubble strategy acording to ICM and you're probably push/folding most hands.