My mom gave me some sourdough starter and directions on how to care for and use it. The idea is to always save some starter from every batch so that it ages. Supposedly, the older the sourdough starter, the better the taste.
Here's a link with more information on how to make your own sourdough starter...
Sourdough Starter Hints
Always save 1 cup for next time.
Store in refrigerator (in glass jar with lid)
“Gray” is ok (water on top)
Use warm water only- not hot.
Feed or use about every 2 months or sooner.
Mix with flour and water to feed (see below).
Sourdough Waffles or Pancakes
The night before, feed the starter by putting it into a bowl with
2 ½ cups of flour & 2 cups of warm water. Put in a warm place
overnight. The next morning, save one cup of the starter and refrigerate it.
To the remaining starter, add:
2 Tbls sugar
1 tsp salt
2 Tbls vegetable oil
1 tsp baking soda (add soda last)
Add ingredients to bowl of starter, adding the baking soda last.
Whisk together & cook in a waffle iron or in a skillet for pancakes. Leftovers can be frozen and will toast nicely.