Hi, Leeann: Elizabeth is right on all counts. I'd say the first thing to do is talk to a lender to make sure you're going to qualify for a mortgage and to find out what your comfort level will be with a payment. Don't forget to include the taxes, interest and insurance in your payment to get a realistic idea of what you want to spend each month.
Then find a Realtor you like and form a real partnership with her/him to find your new home. They can set you up with emails from the MLS in your preferred price range. That way, when you decide to go out looking in person, you'll know a lot about what type of home is available.
Also, make sure advance decisions about where you'd like to live. Buyers who are unsuccessful are often unsure about where they want to be geographically and it leaves them too large of an area of consideration, becomes confusing and ends in frustration. Location is a decision you can make before you start to look -- based on commute distance, school districts, access to services, proximity to family, etc.
Best of luck!