I have a tri fold alluminum ramp when Im just running the quad from home to the shop I work at or a field close by to work in. I always take the Toy Box to the desert.
I like Fox and Arai. Ive always stayed away from Bell. Shoei makes some nice and expensive helmets.
Ive run Scott goggles since the 80s. I wear glasses, so I run the 87 models.
You need gloves unless you want callouses on your hands and want to freeze your knuckles(if its cold where you ride.)
A flag is a saftey item that is cheap and easy to install.
After that, the rest is really what you think you want or need on the quad.
When I bought my 700 the first things I did were twist throttle, 6 pack rack, exhaust and intake. Then shortly after I did a programmer(you should do the programmer before the intake and exhaust if not at the same time).
If your riding dunes, get some paddles.
If your riding rocks, get some decent skid plates.