start with what most think has the hard way of growing go with regular seeds and sex em to get a mother you can keep.
I would order 5 regular seeds grow them,like you would a fem seed but just before you flick the switch to 12/12 off take a couple of clones of each of the 5,and label them a/b/c/d/e,and just keep the ones that are female for future.pull the males in the main room and by doing this you got a plant that you can mother for has long has you like,regular seeds are far more forgiving then femanised seeds.
In the long run you will be far better of then doing seed run after seed run,because i would not even think about keeping a femanised mother,it will throw seeds in the end they all ways do.
Its far easy for ya to do regular seeds now sites like this are about just keep photos comeing of the nodes once ya flower and we tell ya the males from females.