Exactly what the title says. I have no idea what I'm doing, and it seems that every time I sing for more than 30 minutes, I loose most of my range, so I'm obviously doing something wrong. Not to mention the fact that my tone is... poor.
I need a list of exercises and such that I can work on. I'm willing to dedicate around 4 hours to learning every single day, I just need to know what to practice. I have absolutely no idea.
Any help or suggestions would be greatly appreciated.
EDIT: Before someone mentions this, yes, I sing from the diaphragm. I've been playing wind instruments for years and I'm intimately familiar with the concept of air support.