Whipmagic saidIf you have never seriously worked out with weights before, I'd suggest you invest in a few sessions with a personal trainer. That will get you jump-started, and he will teach you how to do the movements in a safe and efficient way.
might not be a bad idea. some people get over zealous and push out heavy weights while swinging their back or arms, or grt so tired at the rnd that they out the weights down in an awkward way. Form is important, just remember that-- get the numbers out of your head(generally speaking). Aim for 5-8 reps, the idea being if you can do more go up in weight - all the while, lifting properly!
ps: i am aware of the irony behind me saying forget the numbers, then giving you s target number to hit. Haha.