I made a starter per King Arthur site. All the directions are there with tons of info. I wanted to make m own with no yeast, only flour and water. When you read info here and there you may think you will have an active starter in a week or two. Think again. You will see that many things affect the timing. Mine took three weeks to become strong enough. If there is one bit of advise I would give you it would be to be patient and read all about starters on King Arthur.