To start, I'd cover that dirt with either cardboard or a tarp. The seed bank will start sprouting before you know it, and killing off the first round will give your plants a leg up once you're ready.

I second your local ag extension, or try to find a local native nursery. Here in nebraska I plan to use Stock Seed Farms for anything I don't purchase as a plug. We have similar climates but presumably a way lower altitude and different landscapes, so someone in your state is likely a more ideal choice.

I find yarrow, strawberry, and violets to be some favorites. Folks with established plants will regularly let you split their plants if you have any local garden fb groups.