1) Figure how many girls you pan to have, and budget accordingly. If you must use an ATM be very very careful.
2) Break many of your large bills for small bills before crossing. $20 are great for paying the girl, but a collection of $1 and $5 avoids the agrevation of the waiters attempting to rip you off.
3) Viagra - it helps you perform when the pressure is on, I like / need GFE to get off, but Viagra helps when a provider is less accomodating. You can by single pills at most pharmacies.
4) Don't over drink or lose control. TJ cops are looking for an exuse to bust a head, don't stick out and be an easy target.
5) Leave additional money in your car incase you are robbed you can pay to get out of the parking lot.
6) I like to take a massive dump before crossing the border to avoid having to shit in TJ. The guys in the toilet control the toilet paper and will slowly dole it out to you.
7) HK, AB, CC are your best places to start. Maybe after you are seasoned you can attempt some SG.
8) Be agressive! Go for what you want, be patient. (At AB the more agressive the girl, the worse the service - my experience)
9) Have fun, but never tell anyone from your real life of your trip, that's what this board is for.
Oh and welcome to the wonderful world of mongering. It's not too late to turn around and not do this, it sounds better than it is, and it's a big waste of money but some of us are addicted to fucking young fresh pussy.