As for my first experiment malting buckwheat, I plan on using MoreBeer.com Economy All Grain System as a malting bucket and as a mashtun later on. I have purchased my buckwheat from my local natural food store Harvest House. It is important when buying your own buckwheat that you read the label and confirm that there is no cross-contamination with other wheat based malts. Your buckwheat has to be 100% free of wheat for your beer to be gluten free. Buckwheat will be the basemalt (fermentable sugar) in your brew.
Check out this great website for malting grains at home here