Depending on how dense a population you wish to grow, it can be simple, or it can be very labour intensive. The simple way won't produce great numbers but there is little effort involved.
Gut loading can be via spirulina or Selco type foods.
If you want to produce significant numbers, then the work becomes greater proportional to just how many you wish to produce.
My web page gives you a description of how I progressed, but is not totally up to date as I don't recycle the water now; I make my own salt water mixture. Also, I grow in 20g garbage pails that I used to recycle the water in and can step up to 55g olive barrels if need be.
I feed Tahitian Blend exclusively unless I just gut load a specific food like spirulina or Selco just before feeding them to the tanks.
This means that I can take shrimp from any stage of growth and the nutrition level from the Tahitian Blend already in their system is excellent already and occasionally gut load of sp. or Selco for variety of nutrients.
RAISING BRINE SHRIMP
Viewing my methods may give you ideas on how to scale your own operation to your needs/wants.
One very important thing to remember and that is to make sure the cysts you buy have been properly stored at 40F or a little less. (as in refrigerator)
If they sit on the LFS shelf too long, they either won't hatch or will have a poor hatch rate and survivability.
I buy mine from Brine Shrimp Direct, the top quality ones that produce best.