If you have not already done so, go to "Sailingtexas(dot com) and look at the resources and information there. You will find links to sailing clubs and groups in the Galveston/Kemah area and info on the sailing conditions etc.
I sailed for years in Texas
lakes too, and enjoyed it. But, I learned more about sailing in San Francisco
Bay, while coastal cruising, offshore racing
etc. Tides, currents, larger seas (waves + swells), fog
, higher winds, and such make for a different and more challenging environment
, and in my view, more fun.