To be honest that's probably one the easiest part. Usually they will come out and ask you what are you after. Or they would just say wat kind of agreement they looking for. One girl I talked to even straight out listed the services she will do amd at wat price without first doing the small talk or introduction.
If not you just ask them direct, after awhile you get the hang of it. Then you negotiate. The hard part is later on.
Anyway sorry for the late reply.