You don't want to come near Dallas anyway if you're trying to learn "how to do it right"
Hide as well as you think you can, and then put more brush on to hide better. If you choose to call, watch what the ducks do when you blow your call, if they pitch towards you or slow their wingbeat they probably like it so keep doing it. If they ignore you or gain altitude, stop, and don't do that again. When you're out hunting or scouting, watch where ducks in your area go, they go there for a reason. Find that spot and hunt it if possible. Duck hunting is pretty situational, so you won't learn much about public marsh hunting if you get a guide trip over a private tank that birds already pour into. Maybe still worth doing if you want, but i'd either get a guide trip on a body of water similar to what you'll hunt or just save your money, that's just my opinion. Good luck and have fun