What are you looking for in a girl? age? body type? race? hair? and also very important what level of service are you after? FS (sex+BJ) sGFE safe Girl Friend Experience (sex plus kissing DFK/LFK, DATY oral on the girl, Covered Blow Job), GFE (all the sGFE stuff but with BBBJ Bareback BJ, BJ no condom) or PSE (Porn Star Experience which means things like Cum In Mouth/on her Face/Boobs, Swallowing, things like that) also what is your budget?
Once you figure these things out you can then look at the girls who are paid advertisers on PERB and decide which ones meet what your looking for, if a girl advertises on PERB you can feel comfortable knowing she is dedicated to giving guys a good time so as long as you like her pictures and search for some reviews on her you will be able to find what your looking for easily. Then once you have learned what you like and seen a few girls feel comfortable trying new girls no one has seen yet and remember to post reviews.