There are a few options with financing
FHA: 3.5% down of the sales price
VA: Military service required 0%
USDA: Home must qualify and income qualifications as well 0% and you can finance the closing costs if needed.
You will also need closing costs which you can ask seller to pay all of or some of and they range from 3-5% of the sales price.
Best option is for you to contact a local lender to see how much mortgage you qualify for. Hope this helps and best of luck to you.