I'm not sure what you mean by "send in the contract". the contract or letter of intent is usually a lengthy document detailing the length of contract (1 year), salary, etc - standard contract stuff. You will probably get a separate packet from your GME office with info about housing, benefits, etc. Most programs will have an orientation where you fill out lots of forms.
The only thing sent in with my contract was a Hershey's bar...which I imagine is only done here locally.