Step 2: Pots and Planting
I took a trip to the garden store after that, and told the employee there that I needed a bag of dirt. I bought the MiracleGrow stuff in the picture below. It occurred to me later that actual seed-starting soil/pellets are sold, and could have been better for this step. However, the soil I bought worked fine as well.
I then set up in my garage, planting seeds of each variety, making sure to keep everything organized by species. I ended up with 70 plants, and used that number to help decide how large of a frame to build to hold all of the small pots. I wanted to have a fairly high number of plants to account for seeds that may not work, and plants that die early.