Bring sunblock, bug spray, clothes for warm weather but also a sweatshirt or sweater for evenings.
They have a ton of things to do at the resort. Make sure you get a list when you check in.
There are some places to eat in town-Crispers in Vero, Charlie and Jake's in Sebastian, Casey's Place in Vero.
We usually eat at the resort when we are staying there.
There is a shuttle that goes from the airport to the Disney Resort (you have to arrange it.) I believe it is called the Melbourne Airport Shuttle. My family took this back to the airport on departure day.
If you need any other info, let me know.