why are you priming the keg? I mean, you can, but that creates more yeast in the keg bottom, making it harder to ever transport it.
Unless you have no space int he fridge for it and thus want to 'bottle condition' at room temp a while, I say put it on gas at serving PSI for 10 days and start drinkin.
Otherwise its like 1/2 cup sugar, and seat the lid with about 30psi (unless your keg seals easily)
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10