Depending on where you live and what your background is (veteran, low income, etc) there are various programs that can help with your request. There is no single answer to this question.
To point you in the right direction would require a great deal more personal information than you should post in a public forum. Feel free to send me a private message (click on the little red envelope under my avatar) with some background info and I'll see if I can find a program to help you out.
Good luck!