I would almost say, don't even bother with the kite the first afternoon. If you can find some bunny hills and start practicing J turns and how the Bionics feel. GI boards generally ship with the middle of the road Bionic cubes. You can get softer or stiffer cubes depending on preference.
Starting out don't run the tires at full pressure. You'll find yourself going real fast, real quick.... and the bunnies won't be the only ones making squealy noises. Drop the air pressure down to like 40-45. GI Maks have a nominal max pressure of 60 psi. On a hard kitchen floor, that will scare the bejeezus out of the wee furry ones.
+1 for the foot straps. It really does effect how fast you can turn and avoid things.. Run them tight enough so that you can use them for leverage when turning, but loose enough so that you can bail without getting snagged.
It sounds silly, and the neighbors will point and stare, but go outside and stand on the board with your feet in the straps. Lean forward and back to see how much leverage it takes to turn (while you are standing still). While the board is still stationary, jump slightly up and back as if to bail. Make adjustments to the bindings as necessary.
Consider getting the Progression Landboarding DVD. Well worth it. In a very small field, it is unique in that it not only gives instructions, but goes through the most common mistake scenarios ("this is what you want to do, but a lot of time....this is what really happens").
Get a helmet that protects the back of your head. Cinched down, you should be able to hit the forehead area of the helmet fairly hard with the heel of your hand and not have it shift. If it moves on impact, then it's just the illusion of protection. Optional stuff:
Wrist Protection (flailing can be instinctive)
Eye protection (sunglasses are not protection... especially if the frame breaks while underneath the chinstraps)
Helmet with chin protection (landing on or getting whacked in the chin is not unheard of... childhood endo right onto my chin.... wheeee)
Sure I left out something...