All I can think of is what I would have liked someone to tell me before my first punt.
So here it is
Never pay in advance, put the money in the woman's hand when u see her.
If it's not the woman from the photos don't pay her an have the guts to say 'sorry I've changed my mind' an walk away. Don't worry, she won't chase u down the street. Haha
Just book half an hour on ur first time. It's all new an exciting so you'll probably not need longer than that!
Also don't just dive in with blowjobs an sex straight away. U have time, u don't want it to be over in 5 minutes. If she's hot, undress her yourself, suck her tits an lick her out. It's not all about ejaculating.
Remember, she's the one getting paid! Don't worry about what she might like. Do whatever u like!
An most of all, enjoy yourself