If you rent a scooter do you need anything and how do you get on rides?

You have to ask each ride. Most of the bigger rides you have to go through the exit. But, each ride is different.

I don't think you need something specific to rent a skateboard, what I do know is that if you have any medical condition and you can check it, the Disneyland City Hall staff give you a special pass so you don't line up, it's called Return Program, They give you time to go to the ride you want without having to be there holding the line and it is super comfortable for the disabled person!

Just 35$ to rent a scooter

Castmembers will assist you to get on certain attractions.

Only rides