Don... if I was a PF raiser, I will ALWAYS throw out a continuation bet... about half the time, if they don't hit, they'll fold to your semibluff... It doesn't have to be crippling though... If you PF raise to 80 in the 10-20 level, and get one caller.. On the flop, whether I hit or not, I'll bet between 120-180, depending on what flopped... If he calls/raises,and you don't improve by the turn/river, you're done w/ the hand...
As for chasing flushes and straights... if you've got odds to draw, it is a crime not to... Example... You limp PF w/
... Three other people stay in the hand... Pot is $120... Flop comes
... You're about 1/3 to make the flush by the river... if someone bets 30 into the pot, you're betting 30 to win 150 or 5 to 1... easy call... Also, your implied odds when you hit are HUGE...