Welcome to Permies!
If you can get your hands on old hay or straw, you can create a no till garden with that. Read up on Ruth Stout - deep mulch gardening, and also lasagna gardening (layering mulch, including paper). Personally I am not a big fan of paper and cardboard, as there are nasty chemicals involved in the production of paper products.
As to large scale seed sources, try Fedco
https://fedcoseeds.com/
Or, try Jung’s
https://www.jungseed.com/.
I have had good luck with both suppliers.
I have a couple small words of caution. The first year of gardening is going to be one of soil building, normally. It takes awhile to go from sod to productive garden. Also, starting with 1/2 acre is pretty ambitious unless you have significant gardening experience.
Best wishes. Keep us posted!