Most bread recipes mention the amount of yeast in their ingredients. I use 2 teaspoons. I keep a small jar of yeast in the fridge, the rest goes into the freezer. It keeps there for at least a year. If you are new to bread making: start your machine with all the ingredients, wait about 10-15 min, check and see if the dough is too dry or to wet, it should be by then an nice, slightly sticky ball. If too dry, add a little water, if too wet maybe 1 or 2 T of flour. Now restart the machine, works for me.