i was in a similar situation here in the 70's reading
bill mollison and all his plants were very "foreign' to me..
So I used the basic info of
canopy, understory, herbaceous, vine,
root, etc.. to decide on what to plant here..although I've had to start over since a housefire destroyed a lot of my surrounding area as did moving house and son's house..so a lot of our
trees are babies again.
first think about what you like to eat (self
sustainability) and go with that if you have the property situation for those plants, OR think about what you can
sell if you are going commercial.
Personally I get a bunch of seed and plant catalogs and go through and make a list of what I like, what grows in my zone and climate and what plants will work together (acid, alkaline, etc) and try to fashion some plantings in that way.
I generally here start with a tree, but when I have a tree loss, sometimes I just work around that...as here I had some serious rabbit damage which killed several trees above the graft this past year and am replacing them, but not in the same place.
welcome and best of luck