I’m not a vocal coach and haven’t taken formal lessons, but here’s my little bit: Just an added note to the above…like jayzer said, air support is KING. Proper vocal support starts in the diaphragm, and also will help you a little with maintaining your pitch. To know what proper support feels like, take a really deep breath and hold it. You should feel like your stomach is being pushed out. The trick is, to maintain this while you are singing. Practice taking some deep breaths and holding them just to get the sensation, and then try singing while pushing out with your stomach.