I'll second Thud's point, don't worry about how much you lift, only how you are lifting it.
Also, try to work your entire body, not just your upper body. You need to balance your body.
Here are a couple of decent sites, some is good some is fluff ( I find a lot of that in weight training material):
http://www.cyberpump.com/index.shtml http://www.drsquat.com
Start out pretty easy for the first couple of weeks atleast, just doing general exercises and focusing on the major muscle groups. Once you and your body are used to it you can push harder and go for more sets for each exercise, and possibly split up your routine to work longer on fewer muscle groups on different days. But the important thing starting out is slow, focused reps, fewer sets, working the major muscle groups.
I've been lifting weights for quite a while, if you have any questions let me know. Sorry I can't be of too much help right now, at work.
What are your goals? Fun, increase strength, increase size?
Newbie-wan is a good source for this info.