Hi Diana, when you're first creating a starter from scratch, it's fine to feed only once a day until the starter begins to rise consistently (twice). Occasionally you'll see an early rise on day 1 or 2 that is caused by a bacterium that gives off carbon dioxide. It's best to ignore this rise and wait for the starter yeast to kick in and cause the starter to rise two days in a row. When you see this kind of rising behavior, you'll want to begin feeding twice daily, which will help keep the yeast more active and vigorous. It's also important to stir your starter well each day during the creation process, as this can help prevent mold from developing.  

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