We use sheet mulching for both our gardens and our raised beds. In our main 'ground' garden, we put down:
1. A layer of cardboard over the grass & wet it down completely with the hose.
2. Covered the wet cardboard with about 6" of a fresh hay-cow manure-urine mixture we had from cleaning out the barn.
3. Covered that with a thin layer of a pretty crappy sand/topsoil mix we bought a truckload of. (Basically sandy fill dirt we bought for around the barn entrance to keep the mud down when it rains.)
4. Covered that with a few inches of a compost/growing mix we purchased a truckload of. Everyone locally raved about how good this particular mix was, but once we started digging into it, it just seemed like another version of the crappy topsoil/sand mix. But we figured we'd give it a shot anyway and see.
5. Covered this all of this with 1-2 inches of cedar mulch.
We spent the fall and winter building this up as time allowed. During the building we just threw in everything from wheelbarrows full of leaves, more cow poop, chicken poop, saw dust, kitchen scraps, old potting mixes we had. Anything we had, we threw in, regardless of what "layer" we were working on. The chickens also had access throughout the process, so they helped mix everything in. I did bury the kitchen compost, to try to keep mice and rats out.
The 1st spring we planted:
**Tomatoes (many leaves, but not much fruit- was expected--->from the high nitrogen content). Our Cherry tomatoes did great though.
**Serrano peppers (did great)
**Green beans (did poorly)
**Wildflowers for our bees (did great and re-seeded)
**Basil (somehow this got in the garden, and completely took over one side of it. Our bees loved it, so we just left it. I figured the roots will help aerate the soil and the dropping leaves will add mulch).
**zucchini & yellow squash (did poorly- was shaded too much by the basil probably).
**potatoes (have no idea what happened to them

**Cucumbers (did great). They climbed up a nearby oak tree, and that was the 1st time I've ever seen a rat in a tree.

**Cantelope and Watermelon (did great, but field rats ate holes in them before they could mature).
**Corn (did great) I didn't plant much due to space.
Notes:
> I wasn't expecting much the 1st year as it would basically be a cold compost pile, but I had seeds, so I planted them. I figured if anything came up, it would at least be a cover crop, if nothing else. If we got any type of harvest, all the better.
> Aside from climbers, there was no rhyme or reason to where I planted what. I tried to allow adequate space for plants, but other than that, I just stuck things 'wherever', and tossed wildflowers everywhere for our bees.
> I built a rabbit proof pallet/chicken wire fence around it.
Problems:
> Squirrels dug up the corn seedlings. Now I put metal (cans) or plastic (yogurt containers, sour cream containers, etc.) "collars" around all seedlings until they're semi-mature.
> Rats &/or squirrels ate most of the tomatoes and melons. (not sure how to fix this problem).
> Rainwater ran off of the mulch, didn't soak in, so it was pretty dry for the shallow rooted plants. After the 1st summer I "rearranged" the soil. I now have a berm around the whole thing (kind of like a bowl) and a series of trenches (walking paths). I plant in the high parts or hills and sides of the hills, bury compost in the high parts, and mulch with leaves, old alfalfa and hay, twigs, wood chips, basically anything. Rainwater now collects in the trenches and soaks in. Instead of running off the single "mound" or "plateau" that I originally had.
One year later, everything we've planted in it so far is doing very well. We still have 1 tomato plant producing and 3 pepper plants producing, even in Dec. Right now we have: broccoli, lettuce, sugar snap peas, shelled peas, celery, onions, and cold tolerant wild flowers growing. And of course our tomato and peppers.
I know that's a lot of info, but I just wanted to show that it doesn't have to be a perfect mix of anything particular. If you use your local organic matter, the worms and microbes will come. It just may take a little longer than usual. I find it's much easier to work with native organic matter to grow native plants & crops, and make smaller raised beds for some things that may be non-native, or that may need specific soil conditioning. You can always tuck things into those smaller "special" beds. For example: we have special beds for our grapes. We pour old watered down wine on them. Onions and strawberries LOVE these beds, as do some carrots and eggplant. So we just tuck them under the grapes. Only one or two eggplant though because they get big. We also plant a pole bean or two by each grape. If aphids come, ladybugs come soon after to eat them up. Our grape arbors are painted white, and ladybugs seem to be attracted to the light color.
I used to be super OCD and planted by the book, and tried all sorts of remedies, techniques, etc. And nearly gave up on gardening, because nothing ever worked "the way it was supposed to". So after many many years I had all these seeds and all this time & energy wasted and nothing to show for it. So I said "screw it" and just threw things together, watered them if i remembered to, and lo and behold all sorts of things started popping up and thriving. I had no clue what some things even were until they matured. Now I randomly try everything and keep what works best for me in my area.