#1
So i'm attempting to learn to sing properly, and one of the big things I always come across is singing from the diaphragm

I'd just like some clarity on how that's actually achieved, cause I 'think' i've figured it out, and that it involves sort of tensing the stomach to force air out, and make my tone a lot less breathy/weak

Just wanted to make sure I was doing that right, or at least wasn't doing something massively dangerous
#2
No, that is, in fact, incorrect. It is one of the most popular misconceptions about singing, though.

Check out:
The fourth paragraph called "the hold of the breath" http://thebelcantotechnique.now-here-this.com/index.php?option=com_content&task=view&id=33&Itemid=35

Item #3 - "push with the diaphragm" http://thebelcantotechnique.now-here-this.com/index.php?option=com_content&task=view&id=32&Itemid=34

... and if you don't believe that site, take it from a guy who has a string of gold and platinum albums and has toured the world, both as a headliner and with bands like Kiss...

http://www.brianvollmer.com/index.php?option=com_content&view=article&id=47:inhalation&catid=1:latest-news&Itemid=50

CT
Could I get some more talent in the monitors, please?

I know it sounds crazy, but try to learn to inhale your voice. www.thebelcantotechnique.com

Chris is the king of relating music things to other objects in real life.