Yes, typically, there is 10% that is due, but sometimes incentives require more (ie: the Chase AP's that were being offered).
The balance is due at time of closing. I just added on at BLT and needed to defer the final payment until the 1st week of July and they were able to set that up for me (I was not financing, just paying with my Disney Visa).
You can finance with Disney as well. If you go with the 5 or 10 year loan (10.75% with direct debit, preferred rate or 14.25% with direct debit, standard rate), then your first payment is usually 2 - 3 months after starting the process.
You can also put 50% down and finance for 1 year at, I believe, 4.95%. If paying cash, you would send in a check or pay by CC when you send back the papers.
Good luck on your purchase!!