The only thing you need to know is that you must make prior reservations for DME. You can't just walk up to the counter and get a ride. So, be sure to make that reservation, even if you don't have flights yet.
You will receive an info packet, from DME, about a month before you are due to head to WDW. It will have a voucher for each person on the resort reservation, as well as a yellow luggage tag for each person. If you feel that you will need more than one tag per person, you can call DME and they will send you more tags..as long as you ask more than 10 days before travel dates.
There will be directions to the DME counter inside the packet, as well as other misc info you may need to know. You will use the yellow luggage tag on your checked luggage, before it leaves your home airport. THen, it will be taken right off the plane and put in a different area for resort disbursement. You won't see your checked bag(s) for up to 4 hrs after resort checkin. So....be sure you put anything you may need to start your vacation in your carryon bags. I usually put all travel documents in my bag, as well as small travel sizes of sunscreen, toiletries, a change of clothes (at least underwear), and a swimsuit if I think I may want to swim upon arrival.
Any other questions??? Just ask us.