if there are any other tips or advice that you feel like is important for me to know then please let me know. I want to be prepared and I want to do this as correct as I can.
I can't think of any 'other' tips that are anywhere near as important as the ones already posted.
Get the money first. You wouldn't expect a cinema to let you watch half the film to so you can decide whether you like it enough to pay for a ticket. What if you don't?
Don't drink alcohol. You're working and you need to be professional and on the ball. You wouldn't expect your dentist or manicurist to be 'tipsy', would you?
Get the money first.
Know which services you're going to provide and just as important (if not more), which you will not. If you're trying to sell something, people will expect you to know what it is and if you don't they will try to tell you.- in a service industry this means taking advantage of you being unprepared to push your boundaries.
Get the money first. If you don't have it within five or ten minutes max, leave.
Talk, (NOT text, NOT, email) to everyone involved. I suspect you may well have already done this, even if you've been told otherwise.
The only other thing I can think of is make sure somebody knows where you are and is expecting to hear from you. Online dating is a good cover if you don't want to be too candid

.