Actually, you want to be the best competitor on several blocks. Bid as many projects as you reasonably can within your area of expertise. Register at the site that lists projects. It's free to register and makes you a member of the site. Register at several sites to increase your chances of getting projects.
Many freelancers work several projects at the same time.
Just be careful not to take on more than you can handle. Not only must you register, you must submit your skill set at the project site. Your resume must be in tip-top shape. It must be current and an accurate representation of your experience and skills. If you're not comfortable writing a resume you should consider hiring a professional to do it for you.