I would just start by pricking out the larger ones that appear to have nice roots started. That will give the rest room to grow, and just repeat the process as they mature at different rates. Keep them well hydrated and in a somewhat shady area. The sun this time of year can do them in in just an hour or two if they dry out.
I just looked at your above links for the seed mix. Nice mix.
I am looking forward to seeing the photo.
