Hi Thach and welcome to the forum.
A few ideas and suggestions.
1. Get the Explorer chart books
for the areas you plan to cruise
. They're simply the best.
2. Get guide books
as well. There are several. I think Steve Dodge's book for the Abacos is good. Dozier's Waterway Guides editions for the Bahamas
are very good. Lots of info on harbors, facilities, customs
3. Practice or learn eyeball navigation
is crystal clear, lots of areas poorly charted so learn to judge depths by water
color. Always try to enter or leave harbors or navigate tricky spots with the sun high and behind to minimize glare. Also get a good pair of polarized sun glasses.
and supplies can be expensive with limited supply and choice in some areas, especially fresh food
. Stock up on favorites or essentials before you go. If you're so inclined, beer
is expensive but rum