For your first day don't plan on getting out of the marina before 3 pm. Our charter start time was 12 pm and the boat was empty on the dock the night before. We had our briefing and went to Rite Way for provisions and sat there at the dock while they got the boat ready. After we were allowed onboard which was after 1:30 pm we waited again to get briefed on the boat systems and then waited again to get our dink and finally get someone to get us out of the marina. Can't take the boats out without a guide. It was close to 3 pm before we got out, I pitched a fit and got a bottle of rum for my troubles.
Hopefully you will have better luck? Just saying don't plan on going too far on day one!