I could write a book answering your question. In fact on another board I posted a guide covering the topic.
Tijuana offers the following mongering opportunities:
--Bar Girls
--Street Girls
--Massage Parlors
--Internet Escorts
Each has their strengths and weaknesses. The selection is also very much a matter of personal preference.
Bar Girls are probably the most popular choice with Adelitas and Chicago Club being the most popular bars. They are good places to start. (A 30 minute session will cost $50-60, with the hotel going for about $12.) Bar Tropical, Las Chevalis and La Tropa are currently also popular.
I prefer smalls bars as the sex is less mechanical. Iโm also a big fan of the GFE sessions that escorts provide.