Ok, i'm an escortcel, and although i don't have that much experience, i can certainly give you some tips.
1 - Remain inconspicuous and anonymous, protect your identity. This is almost obvious, but many first timers use their actual number and name. Don't fucking do this, use a burner phone and a pseudonym, if you want to be even more anonymous, use an uber instead of a car when going to the escort's place. Don't talk about where you work, on which neighborhood you live, or anything personal, do not be fucking dumb.
2 - Find a "Hobbyist" forum. No matter where you live, there's probably a forum where men fuck escorts and review them afterwards. By doing that, you will know if an escort does a good service.
3 - After you found an escort and checked her reputation, contact her, ask her what services she provides and their respective prices, and make sure you agree on what are the services included and the price.
4 - Never do incalls, you don't want an escort knowing where your house is, always go to her place, or a motel, or something like that.
5 - Take a good shower beforehand, and shave your pubes, if you go to an escort's place and you get there stinking and with a bush between your legs, you're gonna have a bad time. You don't need to go dressed like you're going to a marriage or to a first date, but be clean and presentable.
6 - If she doesn't looks like the photos, bounce. If she asks you for more money than what you agreed to, bounce. If you feel anything off, bounce the fuck out.
7 - Telling her it's your first time isn't necessary, she'll probably know. Those women are professionals on the art of sex, they will recognize an inexperienced men right away. Just be polite, and do your thing with her, she doesn't cares about you anyways, she's only there for the cash.
8 - After you finished your services, don't try to have a conversation with the escort, just put your clothes on, hand her the money, be polite, and bounce. You can contribute to the forums with a review, if you wish.
Of course, there's far more advice, but i've pretty much listed all the basics up there, i think that's all you need. Wish you good luck, boyo.