Don't lie, remember they are the government anything sealed/expunged can be discovered by them.
Don't sign **** today, take anything given with a grain of salt and mull it over for a little while.
I think my first question for anyone looking to join would be "why do you want to join the military?". There's several right answers, and a whole lot of wrong ones.
Remember, you're never going to get what you think you deserve or want. Can you handle that? If not save your time and avoid the military. You have to be able to roll with the punches.
If reasonable talk to other recruiters, if you have any other interests, might get some good information or some better questions to ask. (even if you're not that interested in other branches you might learn something useful)