Welcome and congrats.
A little research on this forum will give you many ideas.
1) we have an Olympic bbq and love it. There will be many suggestions of every kind out there. It's trial and error to find the one you like.
2)We have DishNetworks Tailgater. It works for us and is cheaper than the ones mounted on the roof. As a beginner, don't get one of those grey dishes. It will drive you nuts trying to zone it in.
3) I don't know...that's hubbie's job.
4)Yes, lock your door and your compartments. You just never know who will decide your stuff should be theirs. After years of camping, we got lax this year and left our portable Hondagenerators out. They were stolen...oops. :)
Now, a little more advice....how are you dealing with your mail? Does your insurance cover everything IN the rig as well as the rig itself?
Have an awesome time...and keep a sense of humor.