http://valkyrie-ffxiv.shivtr.com/forum_threads/2652656

This is all you'll ever really need. Study it, breathe it, practice it.

Personally, here's how I'd explain MCH in a nutshell:
-use every oGCD, every time it becomes available, always. -unless wildfire is coming up in the next 5 seconds or something)
-Use every cooldown when they come up, except blood for blood, hold it for a few seconds so you can use it at the same time as hawk's eye.
-As long as you don't fail the two previous rules, you'll end up with an alternating cycle of big wildfire and smaller wildfire, aka mildfire.

If you don't adhere to these three rules, what you'll find is that your opener may be decent but you'll see your dps not sustain properly and drop off the longer and longer fights go on.