This a time-lapse of my sourdough starter growth in action over the course of six hours. It more than doubles in size during that time and is very bubbly.
This is how my starter grows at room temperature on a warm day. I fed it in a 1:1:1 ratio of starter: water: whole wheat flour. It is fascinating to watch sourdough starter growth in action.
For details about how I feed my sourdough starter, check out my How to Feed Sourdough Starter post. I also recommend Tartine Bread by Chad Robertson for learning how to make a sourdough starter from scratch. It has very detailed instructions for the whole sourdough making process, in addition to excellent photos and recipes.
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