Yes, form is really important. I have a library of moves from books by different women bodybuilders, and BFL, but now and then I use a tape. I try to steer away from aerobics tapes with the toning segments in them, and try to focus on more "serious" sculpting tapes if I use them.
I do 3 sets of 12 for my chest, back, shoulders,biceps, triceps, and calves exercises, and I do 3 sets of 24 for thighs and buttocks exercises.
I usualy have anywhere from 5-10 different exercises for each body part I CAN do, and choose 4 of each for each workout, to change things up a bit-like one day I may do butterflies and presses (both flat and incline) for my chest, and the next time I may do flyes and a couple others...it makes things more interesting for me. There are only so many for the calves, so it stays pretty much the same each time though.
When I was weight training after I had my daughter, I ended up weighing less and being smaller than before I had her, I am working on doing it again now-I had a son a year ago.