Hello there!
As the others have said, some more information would be great, as we can then give you the best help we can, but in the mean-time, I'll offer you a few general bits and pieces.
Firstly, Disney is great about access; it's the best place I've ever been for wheelchair users. Almost every attraction is wheelchair accessible to some extent (i.e. you can get a wheelchair to the ride car somehow), though for a number of them you will need to transfer to the ride car. This is particularly true of the faster rides, as they would not be able to secure a wheelchair safely, but does also apply to some slower rides, such as the Haunted Mansion. All of the show and theatre attractions have wheelchair access, and spaces to park chairs.
A large number of attractions now have mainstream queuing, which means that wheelchair users will go through most or all of the regular queue before boarding. Sometimes with mainstream queuing you will be pulled out of the line close to the boarding point, and taken to an alternative area (often the ride exit) to get on. This will allow you more time and space to get into the car and settled.
When you first come to an attraction, there should be a Cast Member at the entrance to the queue. Just ask them where wheelchair users should enter, and they will let you know what to do. As the procedure is a bit different for each attraction, you'll need to ask at each queue.
There is a whole load of information in the
FAQ thread, that may provide you a good starting place. The official WDW
guide for Guests with disabilities has some information, but isn't hugely detailed. There is also a lot of information on
The Mouse on Wheels about ride boarding, and
photos of ride cars can be found at All Ears. Links to the last two sites can also be found in the FAQ.
I hope that gives you something to start from. If there is anything we've not covered, that you're unsure about or that you want more information on, just let us know.
