I always preferred mothers from seeds, both work fine, just my preference.
Start as you would any plant.
Train in a way that that suits your space. I preferred an open bowl shape around the rim of the pot.
Run low nutes, think 1st week veg str. Nitrogen = bio-mass. You want just enough to keep her healthy. If running something like Flora Trio, run a Lucas style formula with low ppm's, basically Micro and Bloom, no Grow.
Keep light intensity low, again just enough to keep her healthy. Also there's no reason not to run 18/6. Low nutes and light will help you maintain size. Once you have her to size you just want her to stay healthy not vegging vigorously, just replacing what you take and staying happy.
About a week or 2 before taking clones cut out as much N as possible and boost PK, this will help rooting.
I like to foliar spray with H2O2 after taking clones, esp.
If I was going to keep mothers again, and had the room I think I'd ScrOG them. Just a smallish screen over the pot. Let her grow up over the screen a bit, take clones, tie her down over and over. Trim away sections and let her refill as needed to maintain size
Just like everything else it's all about tailoring a mother to your own situation. At this point though, for me, seeds and clones from vegging plants just before the flip are a better way to do it.