First grow! Very excited.

Alright folks, I met this old school guy at a party and he sold me three plants for $15!. He couldnt give me much info though, he just said its from a bag of "stinky weed", he just lets nature do its thing in his back yard and makes hash out of the plants. One is 4 weeks old and the others are two weeks old. All of them are wilting and the two younger ones are turning yellow, nitrogen deficiency? I do not know. Im sure my soon to be posted pictures will offer a lot more info.
I want to know the basic essentials on outdoor growing. For the longest time I've been studying indoor soil growing because that is what I wanted to do, but I cant do that in my apartment. I live on the edge of town already so Im going to walk about 1km in the woods and find a nice place to plant them. The only things I know about outdoor growing is that you cant control the climate, takes longer to grow, and the plants grow bigger (I think). Can someone fill me in on the basics of outdoor growing? I heard that soil in BC has a naturally high nitrogen content, and my friend co-owns a landscaping company and has awesome top soil so Im gunna use a couple gallons of that per plant. I also live beside rodeo grounds so I can get some horse poop. I will provide pics of my plants asap so you guys can troubleshoot'em. I just want to know the basics of outdoor growing. Can I still use indoor organic nutrients for soil grows on my plants or do I need certain outdoor nutrients?

^stupid question... Sorry I dont have any pictures yet, things dont wanna upload to my computer for some reason... Is it too late in the season to plant these in the woods? The biggest one is about 5 inches tall with three rows of leaves and the other two can still be considered seedlings, but they have serrated leaves. Average temperatures here in June is 68 and in Sept. its 59. But its predicted that this is going to be a hotter year.