The soil is heavy clay and the top six inches or more is a clay/gravel mix. I'll have 8 or 10 yards of an "engineered" garden soil brought in for raised beds.
The string in the back is the north side, the two trees in the foreground are basically at the south line. I'll drop those and use the logs for raised beds or terracing, as needed.
Here are a couple pictures of the area. You can see one of my Leghorns - she got caught in a sunbeam and couldn't move

I want to have vertical growing space and a covered tunnel for winter growing, so I plan to put an arch of cattle panels over the northernmost bed, which will be 6 feet wide and have a 20" wide path running down the inside of the tunnel. There will be two other 4' wide raised beds, with 20" paths between them, and there will be 24" wide paths around the outside of the beds on the west, south and east.
I'll need fencing around the space to keep the deer and chickens out --- not sure what direction I'm going with that yet. I'd like to get some vertical growing space out of the fencing, but anything grown would probably just be deer chow. I am a bit concerned that the logs I use will be a haven for slugs. Maybe a little duck run around the garden would be useful for slug control and let me use the innermost fence for vertical growing.. Plus, it'd be cool to have a couple Indian Runners waddling around

First step is to drop those two trees and do some terracing on the south side.