Howdy Ags, a little longer in the tooth than you guys, Class of 70. This is the absolute Bible of What and Where on the coast to go Wading or Kayak fishing, get,
"Wade and Kayak Fishing on the Coastal Bend of Texas" by Ray Crawford. Truly excellent and everything you will need. Go by and tell Dave Hayward, Howdy at the Orvis Fly Shop in Rockport. Dave is a great guy and can give you some tips and sell you some flies that will work.

Best of Luck and Gig'em!