Since we grow so many seeds, we usually plant multiple seeds per pot. They are easy to divide when you are ready to plant them in your garden.
Introduce and register are the same thing.
We planted seeds directly in cups and pots outside as we harvested seeds. I plant 3 -5 seeds of the same cross in each cup. I also use gallon black pots and plant all seeds in a pod in those.
Most years we start seeds indoors in the winter. We keep doing different things to try and save time and effort.
When we first started and had less seeds or when we purchased seeds, we were concerned with our survival percentage. Now we just plant seeds and give them reasonable care and go to the garden with all that survive.
These are 2016 seedlings.