there's a book out now, "turning pro", by magdalene meretrix, that's a good, thorough intro. the most important sex worker health advice i have is to find supportive community... i escorted for awhile, only knowing of a couple other workers and not spending time with them, and the isolation made me much more insecure about my choices than i am now, since i've been working in strip clubs and houses where i have other workers to share the experience with. being in any stigmatized group is hard, so take good care, and have fun!