PP gave good advice. Use google. There are a number of tour operators who are booking (as a broker) the same tour. I'd try to find the actual operator and book direct.
You'll have to arrange your own transportation, or pay extra, to get from your hotel to the nearest pickup location. The trip leaves 6:30-8:00a. You can't rely on WDW transportation. You might need a taxi.
edited to add I agree with the PP. Renting a car is the best way. I assume the OP is from the UK. You'll get a better deal if you rent a car through a broker/agency which packages the rental, required insurance and gas plan or rent with a UK specific code which includes those items. Most of us waive the expensive over-priced waivers and pre-paid gas "deal". You don't have that option. Book direct, using one of the promotions most of us use and you'll wind up paying $$$ when you go to pick up a car.