If you plan on using it in the winter, waders are a must, I wear my neoprene waders on cold days. Some days in the winter, depending on if the sun is out in full force, ill wear shorts and shoes cause my feet wont be in the water much, just to kick around.
I personally bring my flippers with me, I may not use them all the time but they are good for kicking to and from near by stumps, brushpiles and whatnot. Majority of the time I will use my oars.
Get yourself a milk carrier or plastic box of somesort to rig on the back to carry extra stuff. I generally bring an emergency foot pump, extra rope, small cooler for drinks/fish.
You dont need to register it with TPWD unless you put a motor on it.
Heres a few pics of mine:



That rack is on the back and is where I generally strap my plastic bin on for storage
Currently I have a fishfinder hooked up to it and a dual rod holder. Debating whether or not to sell it since I dont have many people to go fishing with on my pontoon anymore