I've been on the gh bandwagon for awhile now and like everything PED, dosages are going to depend on the individual. You are going to have to find what works for you. 2iu's is pretty much the agreed upon starting point. I personally, wouldn't do any more than 3iu's in one shot.
Best fat loss by far is fasted upon waking followed by cardio. As far as dosing before bed, only if your're over 40 as you are shutting off your own pulses (greatest hgh release during first minutes of rem sleep), as everyone knows, after 40 everything goes to shit!
And above all don't forget; hgh is a slow and steady game. Minimum 6 month cycle. Preferred 8-12 month and beyond to really see the effects. Don't buy into the hype that it's a big muscle builder, because it's not on it's own. But added to the right compounds, it's near magic in a bottle.