I'm guessing this a bit over done, so, correct me if I'm wrong, to simplify and to not over-think this, it's mostly common sense, here's my advice...
Be on time, or call if you will be more than 10 minutes late: Get ahead of the traffic, if it's incall, make sure you plan ahead, arrive early, plan for traffic, be right on time, not early, not late.
Always be clean. Very, very clean. If you just came from work or whatever, take a quick shower at the location.
Wherever you find your escort, research her: Does it say she likes flowers or wine? Go the extra mile, get that stuff for her. Bring it with you, greet her with a smile.
Know what's on menu in advance and do not deviate from it: Escorts use the usual codes, CIM, Greek, GFE, DOM, etc, ask ahead of time for services or extras like these (if it's not already listed in her ad) and either way let her know what you would like, and if she can accommodate, and there's no arguing with her for anything she doesn't want to do.
Never ever discuss sexual acts or money in person: first thing you do you leave it on the table for her, that's it, don't hand it to her, if you have flowers, hand them over first, then go to the night table or counter and leave the money there.
Be nice, treat her like a lady, and be respectful. She is a real person, you don't need to be intimidated and you certainly shouldn't feel superior either.
Try to read her cues. Don't feel like you need to blow her mind sexually. While noble, and very sweet, she is there for you. Do not hold back at the beginning because you want to last for her, this often ends in not being able to finish at all. Which nobody wants. You can take care of her after if you enjoy that, and if she wants that.
Tip! Always tip. No one care if it's $20 or $200, tip your escort. Unless she was terrible. Tipping lets the woman know that you liked her and that you appreciate her time and effort. This is especially important if you want to see the escort again.
Ask her if she would like to be reviewed. If yes, keep it simple, and do not fabricate. If you say she did something that she didn't, other clients may expect that same service in the future.
She will not be offended if you need to leave right after. Whether you need to get back to work, or just aren't into idle chit-chat and cuddling, do your thing. She will enjoy the extra down-time. If you have a genuine rapport or chemistry, or if you are just enjoying the company and a break from real life, then stay the whole time! She will be happy either way.