You can read the post just before yours for more info.  here are the cliff notes of your typical date.

Expect a two call system.  You call at a preset time an hour to several hours before the appointment time and the provider will give you the hotel name or a landmark if its a house.  Once you arrive call and she'll give you the room number.  If a hotel DO NOT call from the lobby, do it from your car.  When walking through the lobby try to carry a folder, brief case, binder, anything to make it look like you're going to a business meeting.  Once you get into the room you'll most likely be greeted with a LFK and a hug...I try to discretely place the envelope down and then excuse myself to freshen up.  Go in the bathroom and clean up, anything from wiping down the "equipment" and rinsing with mouth wash to taking a shower (ask first but most providers appreciate the courtesy). Its bad form for a provider to count money in front of you, this gives her a chance to count it if she thinks its necessary and it gives you a chance to be "fresh".  Once you're done join her, she'll most likely be sitting on a couch or laying on the bed.  You'll make small talk but she will likely want to know what you expect, most first timers just say they'll follow the providers lead but you can say whatever you are comfortable with (I like to go slow, I want you to ravage me, I'm passive, etc...).  If she is well reviewed and is good at her craft she'll read your signals.  DO NOT embellish your reactions, react how you realistically feel and she will respond.  Even if you know she allows it a nice gesture is to ask if you can go down on her, where she wants you to cum, etc...the date is over when the time is up, most providers will ask how many times you can cum...if you say 2 then she will pace it that way.  These woman are amazing and they know what they are doing, when they turn it up a notch they can have you cumming in a minute so don't worry about getting short changed.  My best advise, honestly assess what you are looking for and research your ass off looking at reviews.  Pay attention to the things you like in the reviews (and don't like)...if you don't want alot of talking and a review says the sex was fantastic but she wouldn't shut up...don't think you'll be able to get past the talking.  Try to find a provider that hits everything on your bucket list.

Good luck

That's the thing, sweetheart, you've got to be willing to do the research. Instead of calling an escort, visit her website. Everything she expects of you should be outlined.
My recommendations as far as payment are concerned are: if you're visiting her, get it over with immediately. Make sure the envelope (if any) is unsealed, and don't talk about it. If she's visiting you, put it in the restroom by the sink. Point her in the direction of the restroom and ask her if she would like to freshen up.
Once you're convinced that she has the qualities that you're looking for, read her reviews. If the reviews are good, complete the Contact/Reservation/Booking/Screening form on her site.  Make sure you have everything you need NOT to be rejected by her, and to make her comfortable with meeting you since you're new.
Usually there is a blank where you can express YOUR thoughts on how the date should go. Think about what you want her to wear, the direction the date should go, and any special fantasies.
If you're nervous and feel the need to get to know her first, put it off for a couple weeks so you can communicate by IM, or email. Never call unless she specifies you can. If you know what you want, and is sure she can meet your needs, AND she agrees to meet you, you're in business!
Everything you need for a first-class first time. make sure you write a nice review, and get your feet on the ground in this arena.

be sure to let her know.  If you have done the proper research and chosen an experienced provider, she will know how to put you at ease.  And you damn well better do your research, or you won't get much sympathy from anyone if the date goes sour.

To answer a couple of your questions, most providers request the donation be in a plain envelope, left in an obvious place for her to see.  She may or may not count it in front of you (bad sign if she does usually).  DO NOT TRY TO HAND IT TO HER DIRECTLY!!!!!

For some providers, the date is over when you pop.  Quality providers will make sure you get the time you pay for.  That is why you need to read the reviews.

Best advice, get VIP membership, and read the Newbie Manual from the link at the top of this page.

Good luck,
Swim