The outcall format has a particular use here: plenty of people living in the area would rather she came to their house than travel themselves. In homes with a garage that's handled without exposure, and for anyone working from home it allows a date in the middle of the afternoon. It's an option worth raising in the first message.
When she hosts, the format is strictly by appointment. Day and time are agreed, confirmed shortly before, and you arrive on time: on residential streets, waiting on the pavement or circling more than once is precisely what you don't want. Profiles usually spell out the hours they work, and respecting them is part of the deal.
The opening message has to be concrete: day, time slot, duration and format, plus whatever questions you have about what the meeting includes. She answers herself, not a third party or an agency, and that's where it all gets settled. Avoid messages at odd hours and repeated calls, because here good manners set the tone for everything else.
The kind of meeting people look for around here is usually relaxed and unhurried. Some escorts focus on massages, others offer long dates with a warm mood, and some are available to accompany you away from home. Each one spells it out in her listing, so it's worth checking those details before writing and asking about whatever's missing.