Lots of sources will tell you how great the VA loan program is, and others will tell you how to get a VA loan. The web page that Lyndia provided below is the most direct source--and probably the best--because it goes to the US Dept of Veterans Affairs.
What you won't find from many sources, especially on the Internet, is a discussion of the hazards of VA loans. And those hazards do exist. By far the biggest risk is occurring in the housing market we have today. I'll explain.
It's important to think long and hard about what your future holds when buying a home. It's even more important when you're buying a home with a no-money-down VA loan. Even if you don't plan to move for 5 years, things can change. A variety of changes in family circumstances (unexpected loss of a job, loss of a family member, new children, etc., etc.) could leave you unable to make payments and unable to sell your home.
To sell your home, you have to have equity, which provides the money to pay the costs of sale. But if you buy without a down payment, you have no equity in either a down market or a stable market. Even when the market is appreciating, it can take years to build enough equity to pay sale costs. Having insufficient funds to sell can lead to snowballing debt and destruction of your credit history. This usually doesn't happen instantly. It builds over time. By the time you recognize that you're in trouble, it's too late. You lose the home, and you can't buy another. Even finding a good rental is hard because of your bad credit.
When purchasing a home, it's important to analyze your circumstances, and only buy if you have a solid back-up plan for the hard times that will come. (A lot of people are having a tough time now--including a lot of ex-REALTORS--because they never had a back-up plan). You won't hear this from many REALTORS who are still in the business, but it's often better to put off a purchase and save money for a down payment than to buy without a down payment. You'll also hear a lot of REALTORS and loan officers try to push you into "as much house as you can afford."
Don't be tempted. Buy as little house as you can get by with, and put away money for your future. (You can always "buy up" to a bigger house after you have established a more solid financial base.) A house should be looked at as only one part of a diversified portfolio of investments that includes bank savings and a variety of other investment vehicles.
Some REALTORS will tell you pie-in-the-sky stories about old ladies who bought their houses for $27,000 in 1964, and sold in 2005 for $1.2 million. But those REALTORS won't tell you about all the other people who bought in 1974 for $27,000, and lost their job in 1975, then lost their home in 1976 with their credit in a shambles. They won't tell you about the vet who bought for $135,000 with no money down in 1990, but then had to sell 18 months later because of a job transfer, but couldn't sell because the market had fallen. They won't tell you about the mid-level manager who bought for $550,000 in 2007, then lost his job in 2009, and is losing his home in foreclosure today because he can't find a buyer, even just for the $460,000 he owes on the note.
A lot of "professionals" here will talk up the up side of home ownership, but few will mention the down side. For a source with a little more balance of good and bad news, check here: http://www.daveramsey.com/article/the-truth-about-real-estat
Best of luck.