As for workouts, find a program written by someone else knowledgeable. Don't just think you can pick your own set of exercises that you feel like doing - there is some science to it.
Watch youtube videos, but actually I'd get a personal trainer in for one or two sessions to help with form. You might not notice all of the correct form elements just from watching a video.
+1.
Rather get it right from the beginning...looking back I wish I had spent some time with personal trainer instead of winging it and later relying on internet and youtube videos, many of these videos from "experts" will lead to injuries judging by the way some of these guys fling weights around.
