I bought some roller blades a couple years ago and roller bladed all summer. It was not hard to learn, and I think I've only fell once in my life so unless you feel really shaky on them, I don't think you need elbow or knee pads.

I'd buy a mediocre pair to begin with.

I'm not really sure what to tell you on 'getting started', maybe you could just go in a less crowded area until you feel comfortable.

Good luck!