Hi, iwannagonow!
Almost all of the queues at WDW are mainstream queues where you stay in your wheelchair through the entire line. The very few rides that don't have mainstream queues, just ask a CM where you are supposed to go (usually the exit or the fastpass line). Each park has a Guidebook for Guests with Disabilities and you can pick it up at Guest Relations. That will give you information about the lines.
Hope you have a great trip!