If I start talking pecuniarily things will start getting ugly, so let me put it this way.
From a few hundred to a few thousand depending on your desired mileage and the lady you choose. The ladies set their own rate cards and menu of services. Negotiating skill and knowing the terrain pay dividend so as a rule the newbie pays more than the well seasoned hobbyist.
Good Luck Tyro!!
My Best,
Mav