Hi Wryter :hi:
You asked "now what do I do?" Well, you want to keep feeding it every day for a while. It takes a period of time for a new starter to stabilize and mature enough to be able to flavor and rise bread dough well. How long, you ask?
Well, one famous sourdough baker/author (the one who popularized the red grape starter method) recommends 11 days, feeding 3 times a day with lots of water and flour. While you can basically bake with a new starter after 3 days or so, Whenever I start up a new starter, I like to give them 2 full weeks of feeding 2 - 3 times per day. What that accomplishes is a good lengthh of time for the microbes in the starter to "shake themselves out", develop strong and healthy colonies of good microbes, get all the bad microbes out, and develop into a mix of microbes that are strong and healthy and can defend themselves from attack from foreign microbial invaders.
In addition, it takes a while for a new starter to develop it's full flavor so if you are patient and give your starter a good start in life, you'll be much happier with the results of your first bake than if you rush it and try to bake with it right away.
How to feed it? Pick a quantity (I like to work with 2 ounces) so I'll explain in terms of 2 ounces but you can adjust to a quantity that you like. So in the morning, take 2 pour out all but 2 ounces of starter and add to that 1 ounce of flour and 1 ounce of water so that your original 2 ounces has now doubled to 4 ounces. 8 Hours later, take your 4 ounces of starter and add 2 ounces off flour and 2 ounces of water so that your 4 ounces of starter has now doubled to 8 ounces. 8 hours later, take your 8 ounces of starter and add 4 ounces of flour and 4 ounces of water so that you've doubled it again to 16 ounces. Then in the morning pour off all but 2 ounces and go through the whole procedure again. Since you've already 2 - 3 days into it, do the 3 feedings per day for 7 - 10 days.
Now comes the caveat - I share Shakespeare's experience of starter's having their own "personality" so you kind of need to get to know your starter and learn what makes it happy. For the most part, they like a slightly warm temperature - between 75 and 80 so if you have trouble with getting it going, you might give some thought as to how you can give it a warmer environment. The consistency of the starter also has an effect, and some so better in a thicker, batter-like consistency while others prefer a more loose, thinner mix. I've found it most convenient to use equal weights of flour and water. If you don't have a scale, many use a ratio of 3 parts flour to 2 parts water - i.e., a cup and a half of flour to a cup of water.
It sounds like your starter is well on it's way, you're so lucky to be in the bay area, I'm sure you'll have a good SF starter on your hands!
A way long time ago, when I first came out several years in the woods and found that online comminications had advanced from Prodigy and Genie to the World Wide Web, I created a bread website. While it hasn't been maintained for a few years, you've find several pages of information about sourdough here
http://www.angelfire.com/ab/bethsbread/FrontPage.htmlHere's another good source of sourdough information in the form of questions & answers gathered over a period of years from the rec.food.sourdough newsgroup
http://www.nyx.net/~dgreenw/sourdoughqa.html