You should have a great trip. Is this a do it yourself trip or will you have a boat and guide?
Here is an article
you should read before you leave. It has gobs of good information. The very best advise is to strip strike instead of trying to hook up with the rod. The two best sources for bone flies is Kaufman's Streamborn
in Oregon and The Fly Shop in California
. These two stores have people who have done a lot of bone fish fishing. You can ask for sample flies and then tye your own or just buy what you want.