Be sure and use puppy food (not Adult). Our BT book says to feed them either 2 times a day or 3 times. If you work all day, feed once in the morning, and once again when you get home. If you can, try feeding another time around noonish.
If you feed 2 times it will be more each time than if you feed 3 times.
Don't forget to take them out to potty when they are finished eating!