Each area has a different company running the bus service
You have to phone your local bus company to find out details of buses in your area or you can have a look in your yellow pages.
Many bus companies now have their own websites where you can see routes and download information. Try doing a search in Google as well.
Some of the new buses have a ramp. If you use a powered scooter you are not allowed to use the accessible buses, and there is usually only one wheelchair space on each bus.