Start by seeing a SP/MA that has been well reviewed and is reliable. And also follow what Go_jets_go said above. And please report back with a review if you can.
What type are you into?
What are you looking for?
Ebony, Caucasian, Asian?
Any particular service that may be a deal breaker, if not included?
Are you into mature ladies? BBW? Slim? Blondes, brunette etc.