I didn't go there 3-4 years already, however don't pay more than 50 CUC. They will try to rip you off, if they see you don't know much about .
You don't have to look for hookers ,almost every girl is for sale there therefore you can easily find regular girls who will enjoy time with you for some financial support.
You can approch any girl you see around,you will find any kind of them, whites,mulattos and more dark tanned as well.
Take your time,there is lots of them

Learn some basic Spanish words,numbers, it will help you to communicate a lot. Also be very carefull, keep eye on your staff,specially cash,they can steal it.
Keep in mind, they are very poor,very poor, therefore may steal everything,even your socks