Therapists are easy to talk to, almost as a rule. If they aren't - probably not the one for you anyways.
The therapist will just give you a run down on how they work, etc, and you can ask questions. At my first appointment I was totally nervous and awkward and it worked out okay, so don't be too afraid. Think about a few questions you want to ask them about the whole deal beforehand if you want to make it easier on yourself, but you don't have to really worry about it.
Since you have to travel, you might want to talk to your Mom beforehand about how often you could get there so you know that information before you have to make another appointment with the therapist, pick session times, etc. But that is really just administrative. If you are going to need some kind of letter for anything, you may want to ask the therapist how they usually handle that stuff.