Exercise your vocal skills often. If you can already sing well, keep your skills honed and your voice in good shape. Your voice is your instrument. Ways to keep it tuned include practicing on a regular basis and singing correctly. If you aren't familiar with proper singing technique, consider spending some time with a vocal coach. Metal singing is demanding and can lead to vocal damage if proper singing technique is ignored.
Join a band. Even if you have to put your own band together, singing with backing instruments is one of the most effective ways to improve. The only way to develop the skills you'll need to front a metal band is to acclimate yourself to that environment as soon as possible.
Play in front of a live audience whenever possible. While rehearsing with your band is a good way to work on your vocal skills, playing live is the only way to test your ability to interact with a crowd. Developing an onstage swagger and finding the right clothes for your stage presence are essential parts of success as a metal singer.
Develop a name for yourself and your band in your community. The only way to do this is to play live gigs as often as possible so you can build a fan base. Though it may take some time to build a huge following, begin by playing in smaller clubs, gaining respect and fans, and working your way up to larger venues.
Record with your band, even if you only make a demo recording to send to record producers. A good five-song demo can play a role in landing you a record contract. If you want to become a metal singer, actively search for a record label that houses bands similar to yours.
Create a website. Maintaining an online presence is important to finding and establishing an audience. Use your website to promote your shows and to offer samples of your music. A website makes a good platform for a professional bio and resume as well.