For starters on the flies, your guide more than likely is going to want to fish what he has tied up. He WANTS you to catch fish so he can get a better tip or repeat bookings. He is more than likely going to want to throw what he has been catching them on. If you get into a bunch of fish, he may be willing to let you try one of yours, but, don't count on it.
The most important thing to know is what kind of "program" you will be doing down there. Are you on a poling skiff way back in skinny water with the guide poling from a platform looking for fish to cast to? Or, are you on a bay boat in deeper water blind casting? Both can be productive!
If you are sight fishing in 1-3' of water, you don't want or need much weight on your flies. It can add to a spooking splat when it hits, and, can end up buried in the mud. In dirtied up water, have some black and purple flies. For clear water, have some tans and chartreuse.
If you are doing the blind casting deal, you will be in deeper water where a little wt. will help get and keep it down. I've seen a day when your basic gray over white clouser minnow was a killer for blind casting.
One of the joys of redfishing is that they normally aren't real picky. Having tarpon or permit not give your fly a second look gets old. Fortunately, that usually isn't a deal with the redfish.