One of the most important factors in singing is breath support, I just took a singing class and it helped a lot, try not to have any tension in your mouth due to the fact that this will affect your singing. Before you sing, stretch properly, chest, back etc etc etc. release all the tension in your body. Also, do warm ups, such as get your piano or guitar and sing and play along major, minor, and arpeggios scales. This becomes very helpful, also remember not to force your voice, singing and pitch should come out naturally.
Hope this helps
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