In many cases a bit of "window shopping" helps you discover out what you need and want in a home. It can also provide a need education on the types of homes that are available in your chosen location to live.
Be certain to do more than browse online. Visit a few open houses. Always remember that an online experience will never provide the true picture of the actual home. It only provides images of a home in its "best light".
Start interviewing several real estate agents. Find one that you feel comfortable with. Ask for references.
Choose a lender.
If you are buying by yourself, find a trusted friend that can be a second pair of eyes and a sounding board.