Even singers who are technically proficient often have vocal coaches. Regardless of your level of expertise, a vocal coach can give you exercises that will stretch your vocal range and challenge you to expand your singing style. Many professional singers have made it to the top without the assistance of a vocal coach, but having one can lend a competitive edge to your singing. If you don't have a vocal coach locally, consider using a vocal CD course (see Resources).
Anything you do requires practice. This is especially true for singing. The voice needs to be exercised regularly to keep it in shape. Overexercising can also be a problem. Find a balance that works for you, but there's certainly nothing wrong with three or four extensive practice sessions a week. The sessions could be simple scale exercises or singing with instrumental CDs. If you sing regularly, with a band or church choir, practice sessions won't be needed as often.
Perform wherever you can. Enter singing contests. You can find singing competitions through databases online (see Resources). Entering contests and competitions is an effective way to get used to singing in front of a crowd, it can lead to financial rewards and, most important, create a resume that can help land you a talent agent. Use an online database (see Resources) to find auditions for theater and other events where you can hone your performance skills and build your portfolio.
Agents have connections. Build a portfolio that lists your singing credits, then approach talent agencies for representation. Your portfolio and a letter stating you seek representation, along with a demo of you performing, are typically the things you need to approach an agent. You can locate talent agencies by looking through an online database that lists agencies, contact and application information (see Resources).