I don't use anything but Promix Hp and a solo cup. and have had a 99.9% rate of success.
1st. off cut small holes in the bottom of cup
2nd. fill cup and do not water yet.
3rd. I put seed below soil about 1/8 to a 1/4 inch below soil
4th. I use tap water out of my Well and slowly water soil until it's moist about two inches below.
5th. I use a LED about two feet above until they sprout usually about 4 to 7 days then I use a smaller less harsh light until they get 6 inches tall and back under LED.
I know there are many ways to start a seed, I've tried the emery board method, the damp paper towel, and a few others, but always go back to the old method and for me it works well.
Patients and not over watering is important I never pull the seed shell off either it will fall off on her own.
Growing more females from seeds
Increasing the level of Nitrogen makes more females So Higher levels of nitrogen and lower potassium will help make more females for the first two weeks Low temps increase the male numbers keeping them a bit warmer and higher humidity, More red light increases chances of Female while more blue well help males. Now I wouldn't suggest putting any nutes in just make sure your soils a good one like Promix HP.
This is in my method and has been tried and true to me over many years of doing so. As I am sure there are others out here with their methods that work just as will as mine do, I just like to keep it simple so I can weed out and issues if something does arise.
what ever method you use I wish you the best of luck and to keep us all posted on your success...