You should get a package with luggage tags, certificate for Planet Hollywood and another confirmation page. As long as you've got your confirmation and you are in their computer system you'll be OK even if you don't get it before you leave. You can always call Disney to double check that everything's OK. Since you're driving you don't need to worry about ME tags. As far as I know that's all you would be missing. As for me...25 days out and no docs yet. *sighs* 
