Haha, yes i get that feeling that i am heading into this from an unusual direction. But that's OK, i am up for a challenge and hopefully i can add to the body of knowledge as i progress through this.
Here are some photos of the space, as you can see its a mix of things and at some point the previous owner cleared some of the trees to open the area up a bit, and i used these cut piles of trees (mostly decayed at this point) for the foundation of my hugelkultur.
The area that i would like to begin planting and starting a food forest would be of to the side, and below the location that the pond has been started.
So i am reading that its important to have a balance of 60/40 or 70/30 natives to edible.
I suppose the next thing i should do, as you said would be to look at the naturally occurring guilds of plants and try and emulate, or branch out from the species that are present.
Would it be wrong to build swales and raised beds with out first disturbing the forest floor thoroughly enough to kill of competing plant roots?