Topsoil with a little bit of compost mixed in. Before planting, test your soil before adding any other amendments.

I'd use everything in an equal ratio except the pine mulch.

I know some say not to use too much compost but I use as much as possible.

I don't think you'll need peat moss. That leaf based compost is super fantastic. You may however need to add some nutrition to the soil. It will be a lovely consistency!

When I filled my raised beds, I put anything and everything in them I could get for free: horse manure, home made compost, chopped leaves from the neighbor, and my own native (clay) soil.

If I had it all to do again, I would mix it all together, let it sit for a couple of weeks, mix it again and then do a soil test. It's highly likely that at that point all you will need is nitrogen, but you won't know for certain without a test. If you need to adjust your Ph, you would add lime to make it more alkaline, peat moss or sulfur to make it more acidic.

yep anything and everything, when starting raised beds a good time to get rid of all that chunky garden stuff. our preffered medium is spent mushroom compost.

len

Here is a link that might be useful: lens straw bale garden

I like the mushroom compost as well. I wouldn't spend money on peat moss if you've got leaf compost. You'll definitely need nutrition and adding some of that fert to the mix and a side dress would be OK. I wouldn't mix in lime but I put Dolomite lime at the bottom of my tom planting holes.

Dan