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strategy for blackjack is determined by the number of decks and the rules. wizardofodds has a strategy generator. just type in the number of decks and the rules and it will spit out the strategy.

you can look up house edge at wizardofodds, be sure to play perfect basic strategy though.

as far as rollover, it depends on if you want to grind it out or go for a big score.

yes it's +EV depending on the game. just don't play games with 2.5% house edge and higher.

this is provided the rollover is 80x deposit only. if it's 80x deposit+bonus then you need 1.25% and...