Ok, I think I know what you got.
What you need right now is to create a system compatible to your aero set up, for the veg room.
You can veg those plants right in the buckets that you have in the aero system just don't run the res, hand water them for now but let them grow in the rocks.
When they're big enough connect the res to the system, fill it and go 12/12.
What you really need to think though for future grows will be to have a veg room and a flowering room.
You can have a 7" tall 3' x 3' e&f tub with out the res and veg 15 plants in there watering them by hand in 5" pots with hydroton and take them to the aero when grown.
ps:
you know, you trying to drive a race car with out any driving experience, right? Read some journals, you need to get a principal idea of the growth steps, but have no fear, many are watching.