Mix yeast and warm water and let sit ten minutes. Then add it to a gallon size bag with the flour, sugar, and milk. Mix thoroughly. That is you starter. The instructions are as follows.
Day 1 is the day you make your starter or the day you split you starter and begin again.
Day 2 squish and mix the bag
Day 3 squish and mix the bag
Day 4 squish and mix the bag
Day 5 squish and mix the bag
Day 6 Add to the bag 1 cup flour, 1 cup milk, 1 cup sugar, seal. Mix and squish the bag.
Day 7 squish and mix the bag
Day 8 squish and mix the bag
Day 9 squish and mix the bag
Day 10 BAKING DAY. Mix and divide the starter and prepare to bake.
*note, open the bags periodically to release the build up of air.
Pour the bags contents into a large bowl. Add 1 ½ cups flour, 1 ½ cups milk, 1 ½ cups sugar. Measure out 4 separate batches of the starter. each in a Gallon ziploc bag. Each receiving one cup. One bag is for you to keep so that you may begin again. Give the other three to friends with a copy of these instructions.