When I first started editing professionally I asked a seasoned editor here at FW if I could work under her and sort of do an internship. That helped my confidence and skill levels a lot! I love to work with a team, so it's that much more certain everything gets caught.
I have a website that has one page dedicated to editing, I think, but the whole website isn't just for editing. I find that word of mouth usually brings me more work than I can handle, so I don't do much advertising. At times in the past when I was doing more editing, though, I would occasionally post on a self publishing message board or somewhere like that, offering my services. The lady I worked under initially got a lot of our work off www.elance.com
, though it was very difficult to get paid very well with jobs from there.
I've heard 1 cent per word as the "standard" price for edits, but in real life I agree with others that there isn't really a standard. I usually use it as a sort of guideline, though, and mark it down if it's an easy job or a friend's, or go closer to the one cent if it's a lot of work. I have a really hard time deciding on pricing, too. I always feel like I'm undercutting myself, but I also know most authors can't afford much.