Thanks for the information so far! as far as how much shadow the trees cast... i took this picture today mid day today to see the shadows cast.
The reason i am only doing the corner is because i don't want to turn my entire yard into a forest and i don't think the neighbors would take too kindly to that as well.
I do however have a good size of land at my fathers property that i could use to plant a good size food forest. but it is an hour drive away and i need to clean a bunch of junk off of it. so i will get to that at a later date to get my food forest fix in.
so just for my backyard i want to keep it clean looking but have a section for food. I even planted a couple blue berry bushes next to that shed in my backyard, and i just planted 2 grape vines on a trellis on my back porch south side. so i will at least have a couple things to eat from my backyard haha.