Everyone's situation is different -so there is no right answer. There are many loan programs. You may qualify for a 100% financing program. Best first step is to meet with a lender (maybe get several opinions), be open with them on your income, expenses, etc. and they can give you a better picture. I have worked with many 1st time Buyers, and purchasing a home can be overwhelming. It is important to educate yourself on the entire process. Make sure that the Real Estate professional you are working with explains everything to you - to your satisfaction. I always want my clients to sit at the Closing- knowing that they fully comprehend everything, and are happy that they made the Right decision for themselves.
With the falling interest rates, and the large inventory of properties, you are getting into a great market as a Buyer. If you don't have someone helping you that you are comfortable with, give me a call. Good Luck!