Your going to need to grow them far apart if your growing outside, so good luck with the 6ft by 6ft thing. Dont mark the trees.... you dont have to freeze the seeds if you are about to use them, use some plastic containers with wet paper towels at the bottom to germinate the amount of seeds you are going to plant and once they've sprouted transplant them outside because if you plan on germinating outdoors there are pest and disease. If you dont want to go advanced just germinate some seeds, dig up a good 15x15 plot of land about 1 foot deep, and place the dirt back loosely so it'll be softer... unless you can afford enough soil to fill the hole. Plant the sprouted plants a few feet apart, wait.. then sex them, grow the females... dont worry about nutes and feeding right now. One step at a time.