To add to what has already been said, yes indeed, get prequalified with a lender. Based on your income, debts, and credit rating, he/she will tell you how much you qualify for. That's what we use as a guide for the price range home you can purchase.
Depending on where you want to live, you may also look into other types of loans. A conventional loan will require at least 5% down, but does have some advantages (like mortgage insurance goes away once you have paid 20% of the loan--FHA used to do this but as of June 1 no longer does). And if you would be living in one of the small towns here or in the country, you might be able to get a rural development loan (RD) which is one of the few "zero down" loans still available.
And Chris is right, once you have been prequalified, have a real estate agent help you in your home search. For homes listed by a realtor, there is no extra charge to you (all commissions already included in the purchase price), and you have a advantage of "one-stop" shopping. Instead of calling the agent for each home you might want to see, you can have your buyer agent make appointments. Plus, keep in mind that the agent on the sign in front of the house represents the seller.
If you need assistance, I would also be glad to help. And the website listed here has a home search feature where you can start your search on line. Thanks for your time.