Kris, I hope you are checking in and reading this advice. Go to the links at the other discussion list that I posted. It has guidelines on vocal health, warm up, technique, do's and don't for singers.
People often don't realize that each of us is born with the physical limitation of the vocal cords' range, and what they are capable of doing. I repeat Hank's advice... If you are an alto, don't stress your voice by trying to sing in a soprano range. ~alice