If you wish to start a friendship chain from scratch follow instructions below counting the day you begin as day zero.

Herman Sour Dough Starter for Cakes Recipes

2 cups flour
2 cups milk
1 cup sugar
1/3 cup warm water
2 Tbsp or 2 packets active dry yeast

Today is day 0. Record the date/day on calendar. Sprinkle 1 Tbsp of the sugar over the warm water. Sprinkle yeast over this and let stand in warm place to double in size. (approx. 10 min.)
Mix milk, remaining sugar, flour and yeast mixture in a large plastic or glass container, (metal objects ****** Herman’s natural growth.) Stir, using only a wooden spoon or paddle.
Cover loosely or place plate over top of container so Herman can breathe.
Herman doubles, even triples at times of vigorous rising.
Place Herman in a warm place. Next day is Day 1 and you now proceed following instructions below as if you�d been given a friendship cake mixture to grow. Try to stir at least once each day.