How do you get a baby on a nap schedule?

My baby is just over 3 months. I have her on a good feeding schedule (5.5 to 6oz at 7, 10, 1, 4, and 7) and we have a bedtime routine, in bed at 8. She has been sleeping through the night for two weeks. She is hard to keep awake when she wants to sleep. A book I read suggests that you should feed the child 4 times a day and have 2 naps: 1 hour in the morning, 2 hours in the afternoon. Anyways, what do you think? Should I get her on a nap schedule and how would I do that if she is hard to keep awake when she wants to sleep?