Every bit of advice you need is on the main site. There will also be similar threads on the forum, well worth investing a large chunk of time reading though everything. And then re-read it.
After all that, if you still want to do it, set yourself up with a free adultwork profile and bite the bullet. Whilst there is money to be made, do not under-estimate the psychological demands/effects. You need to be tough and thick skinned in this business, not for the faint-hearted. That said, I love it.