Here are some random thoughts, in no particular order:
This job is not for everyone. You won't really know whether it's for you until you try.
Escorting is mostly like babysitting, but better paid and you have to have sex with them.
Offers which sound too good to be true usually are.
If you can avoid it, don't live and work in the same place.
Get a phone which allows you to store lots of numbers, and block the ones you don't want to answer.
Try to find a place where you can see people before you buzz them in. When clients book, direct them to a nearby landmark and tell them to call from there. When they do, direct them to somewhere where you can see them before giving them the door code. If it's on a noisy street then give directions by text message.
Get the money early in the appointment. Make sure it's the correct amount and not counterfeit. If you don't want to be obvious about it then you can wait till the client is in the shower to check the money.
Select playlists of various lengths, 30min, 60min, etc so you can tell how much time the client has left by which song is playing.
Guys will always say they like natural photos, not professionally done. But usually they will call the lady with the professional photos.
People will try to take advantage of you all the time. Clients, landlords, other escorts, etc. Be polite, but firm.