Sing, sing and sing
The most important step is how seriously you take singing. And since you want to sing like a professional, you should be able to sing wherever you want. Whether it is your bathroom, or your bedroom, you should sing at all times so that you can become better with time. Try to sing in front of a mirror or in front of your friends, that really helps your voice to stop from shaking. Moreover, you find the confidence as well.
Confidence is a key component for you, if you want to become a professional singer. You should have the confidence and you should know that you are good enough at this. You should be able to show others how you are a good singer and that can only happen if you lose the shy person within you and get the confidence you need in order to become a good singer.
Be the lead singer
Whenever you are singing, or wherever you are singing, always try to be the lead singer. Sometimes people sing in groups, and even while singing in groups, try to be the lead singer. That will really help you build your voice in a way that you will feel that you are doing a good job.
Open your mouth wide
This will help you create the sound that you need to become a professional singer. The singers open their mouths wide because it really helps them create the required sound for the song and you should do it too.
Do not just stand up and sing a song, you should be a performer as well. You should know exactly how to take an audience on and the crowds of today tend to like good singers, as well as good performers.