Hi Linda,
Hope this helps, I got this info from SOAR and I haven't tried it yet:
Starter: Begin with 1c. flour, 1c.warm water, 1/2c. sugar and 1pkg. yeast. On the 5th day, add:1c. milk, 1c. flour and 1c.sugar. On 10th day, add:1c. flour, 1c. milk and 1c. sugar. The 10th day is when it says to divide the batter. I don't know if you should start over or just add the yeast. Let us know how it goes. In case you don't have it, the address for SOAR is: http:/soar.Berkley.EDU/recipes
It's a great site!