Lucille - Fannie Mae programs in most cases will absolutely help you to buy a home. Fannie Mae and Freddie Mac prior to 2008 had "backed" most mortgages in the USA. Due to the high default rate, most new mortgages now are backed by the "FHA". In most cases, a first time homebuyer will not be able to secure a mortgage if it is not backed by Fannie Mae, Freddie Mac or FHA. But as I mentioned earlier the high default rates now has the FHA in the forefront of being the government guarantor for these loans.
Fannie Mae also, operates a website at http://www.homepath.com
which promote the sale of their foreclosed properties. Within that site is another program called "First Look" which has favorable terms for first time homebuyers.
If you have any additional questions please contact me at 914-299-0420