First time doing this. I set up a time with a provider and she agreed. Is it my responsibility to message her the day of to figure out how we will meet up? e.g., meet in lobby, come to room, etc. She didn't ask for a phone number either. How do I handle this?

then you'd best try to contact her. Surprising that she hasn't gotten your cell number.

On how far in advance your date is. The typical arrangement 'seems' to be, once she ok's you and you have a date set...it's thirty dark zero until game day. Then you reach out to her, she'll get your coordinates, or give you a cell phone # or both...and then a couple texts, if necessary until the scheduled time. If you need to confirm that...go ahead and email her and verify that's the deal. Most likely she'll say 'yup'.

Some only email and do not exchange texts or receive calls and, some do. I presonally don't mind email, texts or calls. I don't care how we communicate as long as we do. Just my personal opinion.