My advice is SOIL MOTHERS.
Even hydro growers I know keep their moms in dirt. Coco is fine too. In fact I'd prefer it because it's easy to flush.
You can just keep repotting them indefinitely as they get big... or you can prune them aggressively, even when you aren't taking off bits for clones.
MH light is ideal. A 600watter should give you 60 clones a month no problem if you take care of the ladies.
Keeping them helathy means giving them cycles of veg nutes and then prepping them for cloning with some flower nutes (increased P for roots, decreased N is also good for cloning) and -I've made this mistake!!- Don't forget the CalMag if you are in soilless mix... my clones were struggling for the first couple runs after switching to coco because I didn't think of adding calmag, but they ended up with the symptomatic necrotic splotches of a classic Ca def.