Just dug out my sourdough packet with lots of recipes and the starter recipe.
2 cups of flour, 1 tsp salt, 3 tbs sugar, 1/2 tsp granular yeast, 2 cups lukewarm water.
Stir til mix is a smooth thin paste. Put on lid and set in a warm place to sour. Stir it several times a day. In two or three days it will be ready. Recipes use 1/2 cup starter.
Sourdough pancake recipe: To 1/2 cup starter add 2 cups or flour and 2 cups lukewarm water. Beat until smooth and let stand in a warm place overnight. Reserve1/2 cup starter and put into refrigerator in a covered glass jar. to the pancake dough left add 2 level tbs. sugar, 1 tsp salt, and 3 tbs melted shortning or oil, beat in 2 eggs. dissolve one tsp soda in one tbs water and fold gently. Do not stir after the soda has been added. Cook on a greased griddle about 360 degrees.