re: Poker & Some small ball questions
As people have already said, with the blinds/stacks suggested you shouldn't be looking to play smallball, you should be looking to get it in.
All this is 'generally speaking' and without any significant reads, of course.
#1 - If someone is raising to 750-1000 and you have less than 5k, you should just shove with big hands. Even taking the blinds and raise represents a big percentage boost to your stack, and there's always the chance you'll get looked up by a hand you're dominating.
#2 - With a 20bb stack you should rarely be limping. Sure, from the button or SB with 4 limpers and 87s you're probably okay to limp, but generally you either want to try and take the pot preflop seeing as nobody has given any indication they have a strong hand and will call a significant raise, or just toss your hand and move on.
#3 - If you're getting reraised with the stacks/blinds you suggest, your only real options are shove or fold. Calling for half or more of your stack is pretty ridiculous regardless of the situation.