I just started this year. I started with the erotic section of ........... Sometimes the ads refer you to a web site or cerb, and I took this as an indication of a legit operation.
I also avoided ads that were repeating a lot. My thinking here was the girl might be over worked and not at their freshest.
I also decided to book an hour of unrushed time, that way you get to know the woman a bit more.
And finaly, I decided that you get what you pay for, and found somebody in the $250 range.
Good luck out there and enjoy.
- Jazzi