Hi Gail!
Congrats to you on the vacation pay off! From personal experience, there's no better feeling than making that last payment before the deadline, officially securing your Disney vacation.
If you have an email account, you should have received a "Reservation Confirmation" email confirming your reservation and Welcoming you. Within the next few weeks after securing your vacation, you'll receive a Welcome Packet in the mail, generally welcoming you and your family, as well as park guides, a Walt Disney World map, Photo Pass card and details, any coupons that came with your vacation package, and Disney luggage tags.
You won't get any park tickets or the like, as this will be loaded on your Keys to the World card when you get to your resort. The card will grant you access to the room, any of the Parks, and dining plan if you selected.
Other than that, pack tons of excitement, you're gonna have a blast!