Probably going to take a few tries to get it right, so hang in there.
Light sched? 18/6 20/4 24/0 (what ever you use for vegging.)
One nice thing about 'working' a mom, is that you learn topping well.
I had kept a micro mum in an areogarden. I'd cut it down to almost nothing every 2 weeks.
Always leave a node or 2 (or more) on the branch when cutting down (if for clones or just maint) Those nodes will generate new branches.
As for seeds, stick with reg (non fem seeds) You will find them a bit more stable (your mileage will vary)
Good luck.