M.B.
Hi J.. I am also a first-time mom and I have a 9-week old. She often sleeps through the night, so isn't a great daytime napper, but she falls into a routine depending on her feeding schedule.
I would second the recommendation for On Becoming Baby Wise, because it helps you understand the relationship between how often they eat and when they should sleep. Basically, the idea is to keep them awake for a time--like 45 mins to an hour at least--after they eat and then try to get them to sleep until the next feeding. That way, they wake up hungry and go to sleep happy and tired and you don't have to fight the play-time urge when you put them down for a nap.
It really does help to have a loose schedule, although with my recent transition to day-care, we aren't really on one right now. ;) You just have to be flexible in your expectations, I think.
Best of luck!