If your going to make it a raised bed do the boards first. I never mix my stuff into the native soil because it is hard-pan clay and to much work, plus if you work it while wet it can ruin your soil structure. I'd add the boards, lay down paper/cardboard then put all the good stuff on top. Here are my beds. I dont use boards but I cover with plastic. these have never been tilled and I just re-edge yearly (with a nifty machine called a bed edger) then add manure etc and cover. If you look close you can see the evil Bermuda roots along the bed edges.
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