Do you have to pay for parking at Epcot?

Preferred parking: car or motorcycle – $40 per day Standard parking: car or motorcycle – $20 per day Shuttle, Limo, Camper, Trailer or RV – $22 per day Bus or Tractor Trailer – $25 per day

Yes. However, you do get free parking if you're an annual passholder.

Yes unless you are staying on Disney Property/ Hotels

Yes. Unless you stay on the Disney property

yes you have to.