Alea of Dallas has been doing webcam for a very long time. She's a member here but I have no idea if she would be willing to share details of how she does it or what site if any she uses.
There are plenty of sites and there is one that I've seen have a banner ad here,
www.myfreecams.com
From the women who cam and have been on sites like ECCIE and ASPD and expressed opinions about doing so, their biggest concern was how much the site took of the fee and how long till the money was transferred.
Never use Paypal. They can and will and DO keep money if they find out it is from anything adult.
Many of the cam sites have forums where you could check them out and ask questions.
www.ebanned.com is an adult site that allows people, mainly women, to offer for sale all sorts of things that can be very profitable. It works like Ebay, I have talked to some people over the years who sold stuff like used underwear.
http://www.had2know.com/lifestyle/se...d-panties.html Safe and legal.
Apparently, it is still legal to sell them on Craigslist.
http://dallas.craigslist.org/dal/for/4309963777.html
Biggest issue is maintaining privacy and safety whether on cam or in selling adult wear.