I have some issues playing these hands. Especially the Flush draw.

For instance I'm in MP or LP and Limp with A8s and there are multiple limpers.
Flop Ks 4s 8h

Hand 1: If there is a bet and a reraise do you call, fold, push all in?

Hand 2: goes check around to me, bet pot, or check for a free card?

Hand 3: EP limper goes All in for say $10 and gets a caller who has another $30 behind him which covers your whole stack, do you call, fold or raise all in?

hand 4: EP limper goes All in , folds around to you where your stack sizes are similar. Call or fold?

I know in poker everything depends , but some help would be greatful.