Buy a Texas Gazeteer, it has all the ramps and a lot of back roads and stuff like that.
Hire a guide like Ernest Paty or Chuck Rollins or both and hire some other guides too if you can afford it. I've never been fortunate enough to fish with Ernest or Chuck but their posts are spot on in my book.
Try to resist the temptation to buy too much stuff until you learn a little more.
Maybe get some road runners in 1/8 and 1/4 oz, they catch everything and you can't fish them wrong.
Minnows will also catch everything. Use a size 1 or 2 gold aberdeen hook and bb size split shot.
Just get a Zebco 33 or two for now.
Put yourself about a $200 fish finder on that duck boat and look for dropoffs and creeks and if you are lucky a brush pile.
Oh yeah, troll for crappie at about 1.5mph or so. When they bite best gets into a lot of opinion, just go when you can.
Have fun!
http://www.catchcrappie.com/default.asphttp://www.bigcrappie.com/