Do you own a boat at home and/or have a lot of boating experience with verified time in a boat length within about 5 feet of the boat size you want to charter? If your sailing resume is weak I highly suggest you talk to Grant Headefin at NauticEd. He has online courses and will help with your resume and even handle the bookings and communication with charter company to get you ready and approved. His courses are accepted by Moorings and he has a good relationship with them. There is no fee for his broker services and the courses aren't very expensive. He even has a BVI chart briefing course that is accepted by most of the charter companies so you can do that at home and skip it on arrival.