Don’t know what voice part you are? Ask a musical friend or a local vocal instructor to take you through your range and help you find out what voice type you are. Once you find out, you can begin building your repertoire with songs that both solidify your voice and expand your range. It is extremely important to be singing songs that fit your voice type. Singing high or low notes without a solid midrange, the proper knowledge of your range or the right technique can be detrimental to your vocal health.  The key to developing your voice is to learn the most you can about what makes your voice uniquely yours and building upon that. Also, be sure to pick songs that you love; the more connection you have with the content of a song, the easier it will be for you to learn and the better off your performance will be as well.