If you received a sourdough starter kit from me, then it will have been fed within the 24 hours prior to delivery. How you store your starter and how frequently you feed it will depend on how often you plan on using the starter. Unless you plan on using the starter or feeding it again soon, be sure to refrigerate immediately!
You may choose to store your starter at room temperature, probably in your pantry, and will want to feed the starter 1-2 times a day. The higher the temperature it is stored in, the more active the culture will be, and the faster it will "eat" and therefore the more often it will need to be fed.
You will want to store your starter in the refrigerator, under "hibernation". With this method, you will only need to feed the starter about once a week. The starter is quite resilient, so if you miss a feeding by a few days, it should still be okay.
One of the most reliable ways to test if your starter is ready for baking is the Float Test. All this test consists of is taking a bit of your starter and throwing it into a glass of room temperature water. If the starter floats, then it is ready for baking!