You can't declare yourself a resident of Tennessee if you have a home in Indiana unless you've actually done what most people do when they move: fill out change of address, register to vote, get a TN license, those kinds of things.
However, you can deduct certain expenses, such as your rent, etc, if you're not getting per diem on your taxes.
You can go the cheap route and get Turbo Tax, which will explain what you can and can't take, or pay the fee and have someone do your taxes. Some folks swear by H&R Block. Others prefer to find a good CPA. I'd recommend that once you have your tax information together, you find one sooner, rather than later. The earlier you are, the better service you'll get.