If you have a vacation package you should have received an email confirming your final payment of the balance owing on its due date (which would have been last week). It would have also repeated all of the information regarding your reservation- number and name of guests, name of resort, tickets for x days, dining plan if purchased, etc.
If you have a room only reservation, you would have received a similar invoice after paying your deposit.
This is all you need to bring with you to check in. You will get an email with an offer to do online check in 10 days in advance. But you will not get your assigned room until you physically show up at the resort.
As a PP said: a vacation package mailing should arrive about 3 weeks out with this same information, some coupons and luggage tags, but there is nothing in it that is vital for your reservation.
Hope this helps.