I highly recommend getting this book: http://www.whythailand.net/.   It has everything you need to know about thailand and about the girls.  

The author of the book will even reply to your emails if you have specific questions.    

 I have been to Bangkok and Pattaya.   I like Pattaya better for the girls and the beach.    Most hotels are girl friendly but I always ask before I book reservations.   I also choice hotels based on their proximity to the clubs.

I flew into Bangkok and immediately went to Pattaya. Spent a few days there (nice beach and some local sightseeing), then went to Bangkok for more time. Definitely more sightseeing there and would recommend you hire tour guides in both places. I stayed at the Dream hotel, equidistant between Soi Cowboy and Nana, and also just up the street from the Thermae club - an incredible place on its own (the magnet for freelancers).

I love Bangkok.
You have so many great choices.
Stay near nana plaza.
Escort agency girls are great for a tour....24 hours is very affordable  
Almost all hotels are escort friendly.
You just need to tell them you will be having a guest.
Strip clubs are great in nana plaza
Pm me for other details including best agencies