Park tickets are received at check-in if you are staying at a Disney resort. If you are staying off- Disney property - you should definitely ask your T/A about when you will be receiving the tickets etc.
If you are using Magical Express to get to your Disney resort, you will receive luggage tags and some basic info on that about 31 days prior to your departure. If you're renting a car, this does not apply.
Otherwise the only documentation you really have is something showing your reservation #, what your reservation contains (ie: how many and who in your party, what type of tickets etc).
Hope this helps!
Knox