HA! What the hell dude, don't piss in your water. The extra nitrogen is not needed in the development of a seedling until about 3-4 weeks, then a shop-purchased brand will do you much better. Not to mention pissing on your babies can lead to 1, smells and 2, piss in your bud? Man everytime I see this shit I almost break down.
I say you just plant them and keep the light close. Give it about 3-7 hours of light while it's watered and underground, then slowly increase that to 14-18 as they rise. As soon as the first true leaves come, you should be on 16-18 (although lower exposures to light tend to yield more females. If you have a hot burning light, get some CFL's or Flouro's - they are cheap ($25 dollars max for a good setup of Flouro's) and work great with no heat. Also, if your plants immediately start growing long and tell, or even falling over from so much height, then the light is too far away. Good plants usually stay about 1-2 inches off the ground for the first week or two. After 3 weeks, the plant should be pretty stout and grown, with multiple patterns of leaves and it now that it will enter vegetative growth and it will need the extra nutrients to survive it's expansive growth. Try to keep the nute's to even levels (5-5-5, 10-10-10) and don't go too high (15-15-15, I say, for the maximum - just to be safe).
It is here, where you will have to purchase (well, should anyway) your first true lighting kit. A large reflector, MH or HPS bulb, and a ballast. Good 200-400 watt kits can be fairly cheap at around $100-130.
Before you begin, make sure you really have the time and patience, not to mention the cash needed for such.
And if you cannot do any of this, I would recommend not doing it. The lack of available funds means you are jobless or too young. Marijuana is delicate and must be taken care of with a good eye and determination. You're either in it or your not.
By any means or any path, good luck.