Garden by the pottery studio

This will take quite a bit of vision for you to read this and see what I see, and even more time for me to pull it off, did say 5 year plan? ...maybe it'll be more like 10 year plan.

Ok lots of work to be done but lets not get side tracked... we're garden planning! The picture below will eventually be the front of the pottery studio .

This area is 55 feet wide x 29 feet deep. Windows and a door will be on this face of the building. I want to start here and keep it fairly natural with stone and grass walkways... but clean and short. So here's what I had in mind...

Research to be done:

What type of flagstone, other flat stone or as I was reading in Mother Earth News recycled concrete...

Do I need to put something under each stone or just dig down so they lay even with the ground?

Do the flowers I want to use grow in my zone 3a/b, Spacing the plants/flowers in the beds? (list below)

Work to be done (not including building work):

Remove rail road ties from feed lots fences.

Move bus (oh quite a sight)

Pull weeds & thisle

Level Ground

Flowers, plants, grasses I have my eye on:

Queen of the Prairie,Hostas,Allium,Miscantus Sinensis,Lambs Ear, Euphorbias

I am starting with the smallest flower garden I want, first of all because I have to still keep up with farm chores, but also so there is more chance of survival of each of these areas I want to plant.