Congratulations on making plans for your future! Buying a home is a big step and requires a lot of careful consideration and research. It's not just about surfing the 'net, finding a house you and calling up the agent to show it to you. That actually isn't the first step at all. Determining if you are emotional and financially ready to be a homeowner, in my opinion, is the first step. By working with a local reputable lender in your area, you will learn about what is available to you in terms of mortgages, and what is required to be approved for one. Your lender is one your your team members. The other is an experienced REALTOR who works with you to find the right home in the right area at the right price for you.
In regards to your question, as others have stated, there is the USDA 100% program for first time buyers, there is also the IHCDA programs offered by the state (my last buyers just bought with the IHCDA program) http://www.IHCDA.in.gov
is the website that has lots of good information.
Good luck and if you would like a referral to an agent in the Evansville area to assist you, please let me know.