Mistress, I'm not going down memory lane to talk about the days of blind phone calls and answering print ads. I've seen, but never answered, application forms or the like. (It's been awhile since I've seen anyone new.)
My advice to any sub who reaches out to schedule a sessions is to do your homework: Does the Mistress & you have compatible interests? Can you afford the Mistress' tribute? Check her reviews on sites like these and social media. And if you do decide to contact her, and she asks you questions via email, text, etc. be brief, business-like and to the point. If you want a specific fetish or activity, ask. All she can say is no.
Anticipation of a session, either with a new Mistress or someone you've met before, should always be there. But make the appointment with your eyes wide open and all the info available that you are comfortable with. In my experience, in the rare instances when I didn't ask enough questions or provide enough info for the Mistress involved, those sessions were disappointments.