When my son was born, I read Healthy Sleep Habits, Happy Child by Marc Weissbluth. It was FABULOUS! The two take aways that really helped with setting up my son (he's 14 months now) on a routine was the following: The morning nap should start no more than 2 hours after he woke up. And don't let your child sleep past 8 am, so as to not disrupt his morning nap.
So, if your son wakes up at 7 am, he should be going down for his morning nap around 9 am. It really worked for me. After our son is awak about 1.5 hours, I start the "bedtime" routine: quiet play, reading books, changing diaper, etc. Then, if he sleeps one or two hours, you still have a couple of good hours around lunch time for playing and getting him tired again.
The other thing I always did was put him in his crib, even if he didn't sleep. I would try to put him in his crib around the same time every day so that he would know it was his quiet time. If he didn't want to sleep, he didn't have to, but at least it was his quiet time.
I hope some of this helps! Routines are so good, for the parents and the babies! And children crave structure, so kudos to you for trying to give your children that!
Good luck.