I am not an expert, nor too experienced at winter sowing, but this is what I can tell you. What you do is make mini-greenhouse. I take a one gallon plastic bottle, slice it nearly in half, but not all the way around the diameter. Fill the bottom with good planting medium, soak it. Plant (I do only flowers) seeds as advised on the packet. Duct tape it back together. Oh, yeah. make some holes in the bottom before you do much of anything. Seal the top, but make some slices for heat to escape and some moisture to enter. Place outside. You have created a mini-greenhouse, and the seeds lay dormant till winter eases, then inspired by spring they grow.
Last year was my first attempt....
I had some great successes (the geraniums, pansies, and dahlias come to mind) and some mighty failures. It was cool opening them up to see what had happened. I would imagine as each winter is different, each attempt will yield different results.
Today we planted a bunch, will get a list out at some point, but for now if you are interested, here is the website that got me started.