Can I just plant a seed in my backyard, like far back, and will it grow if i gets enough sun light and water? is there anything else i need to do?
When you plant it, mix some peat moss and good (organic) soil in as large a hole as possible (3x3 max), it doesn't have to be huge however. Other than that just make sure it gets water at least every 3 days and gets about 8 hours of sun. If you want super good buds off it buy some fishy mulch and spray it on the leaves with water. Oh yeah, catch the rainwater to feed your plant, tap is usually bad unless you have a well. If you have lots of bag seeds, just take care of a few but germinate lots and lots and just plant them randomly in woods (not around your house) and you will get a nice harvest for yourself and some for whatever!
Blood meal and Bone meal is a cheap effective way for a good supply of nitrogen outdoors. The sunnier spot the better.