Usually I do not answer questions not related to the mortgage part of the real estate transaction, but since no one has answered you yet, I decided to reply.
Typically, you will have to pay the full, negotiated price for the house at the closing of the transaction. Monthly payments would be made to the mortgage company that you select to obtain financing from for this.
You would be best served to seek out a Realtor in the Lawton area - preferrably one that specializes in short sales and foreclosures. They will be able to advise you and use their expertise to make sure that you get into your new home trouble-free.
I would be happy to make introduction for you to someone in your area if you do not yet have representation.
Please do not hesitate to contact me to see what you can afford and how best to put together the financing for this (or any other) home. I lend throughout Oklahoma.