Ok, well, for the newbies then
I have the seedlings in 6'' plastic cups, and I poked holes in the bottom with a pin to improve drainage and co2 intake.
This is 10 days in so far, 9 out of soil. They all look relatively similar, all on their second set of leaves, two got munched on a little by buggies but are fighting hard.
I use another cup filled with the same soil mix to gauge the weight of wet/dry soil. Seems to be about every 3 days they need a good watering, though this varies with temps and humidity of course. I live in south california.