If you make an appointment, turn up or give plenty of notice of you're not able to.
Be punctual - Try and get to the landmark (which you'll be given when confirming appointment) a little early in case you're not familiar with the area. Nothing worse than being all flustered before you've even met the lady!
Take change - For parking (not to pay for the appointment lol)
Take a shower at the ladies place if she asks 'would you like a shower?'. Most of us prefer that
Mouthwash/deo are usually available too
Don't haggle - comes under being polite
Take time when deciding who you'd like to visit, nothing worse than a crappy first time
Reviews are a good indication but there are plenty of ladies with few reviews who are great escorts too
Last but not least relax and enjoy the ride
Welcome to the forum and Good Luck!
Alex x