SF:
I have used Sunsail (Moorings too) in the BVI (and other places too). They will take good care of You.
Charm the desk & dock staff with a friendly manner & they will get you thru any "newbie" concerns.
This forum can help with any travel, itinerary & other BVI questions you may have.............Have a Great Time.
P.S. What yacht model did You charter?