thanks for the endorsement there, toasty.
i didn't mean to come down all preachy, i've just seen a LOT of first timers disappoint themselves by thinking they're gonna be pedal-to-the-metal f1 drivers out the starting gate when in fact they're driving an automatic 3 cylinder around the parking lot, you know? (not that i'm suggesting you are, either.)
(my own first grow was -fucking embarrassing- from where i'm at now... bagseed in pots on the patio, they maybe got 1 or 2 of those fertilizer 'sticks' through the season lol)
some people do a grams per watt calculation, some do a grams per ounce of soil. the bottom line is that you're not going to be able to do either of those until you know what your own average baseline is, no matter which method you use. and, it gets even trickier because chances are your average is going to keep increasing as you get to know the plant better, yeah?
the good news is that those 2 poor neglected plants on the patio that summer yielded just under a half of schwaggy popcorn, so if you're paying better attention to them than we were.... you do the math.