1/2 questions from newbie

I am new to 10-handed 1/2 hold'em, playing on party. I have a decent win rate, but only because the players are so bad.
I am also pretty poor, and need help pre-flop with marginal hands- TT, 99, AQ, AJ, KQ...raise, call, fold in what position, with limpers or raisers?
just looking for the standard "right" plays in a typical lose, soft 10-handed 1/2 ring game.