I would definitely start here http://gorp.away.com/gorp/publishers/pruett/txcoast/intro.htm

(might be necessary to register to view but it's free and the data is well worth it)

If it's not too late, and if the cash isn't a hurdle, get a guide. I have a place and a boat at Port A, and I guarantee you that first visits and short term trips go better with a guide.
Here's some numbers (Sorry, Capt. Sally, lost yours):

Chuck Naiser - 361-729-9314
Ethan Wells - 361-548-3952
Chuck Scates - 361-727-1200
Billy Trimble - 361-205-1266
Randy Best - 361-533-2058


Freddy Lynch - 361-533-4227

I'd like to add

Jon Fails 361-949-0133

I have done very well with Chuck Naiser if he is open