Join a couple of websites with good exposure. Apply with every website you'd be interested in working with.
Create a website, blog, tumblr, twitter, and/or facebook and post at least a couple of times per week. Get your name out there. When you create the website, think hard about the search terms that people find you with and don't use direct quotes from anywhere else. Google will filter out duplicates. You should also make sure that you register your website anonymously, or you might have to worry about stalkers.
Please note that if you're taking a more independent route, and not just using a website for promotional reasons, you will have to figure out safe modes of payment, legal stuff, etc. Do some research on that. OR
this could be useful. Doing this independently will be MUCH harder than with a website, but you'll get a larger chunk of the profit, will have less rules, etc.
I have no idea if you're interested in camming, but that can be an excellent place to start. Lots of women on myfreecams and mygirlfund sell photos and videos in exchange for tokens. You will generally have to give live interaction first, though, so people can get to know you. But once you get a following, you can primarily sell videos and pictures.
Hopefully my post was helpful.
If not, there is a ton of information on promoting yourself on stripperweb.com.
Good luck!