B.L.
I have a completely different experience from the other mothers who have commented here. Neither of my children slept through the night on any consistent basis until they were about 18 months old -- which is when I night-weaned them (Both nursed until about 3 years). With a one-month-old, I would say the most important thing to start trying to establish is that night-time is for sleeping, not playing. When he wakes up, keep the lights dim, snuggle, nurse, sing, listen to music, but all soothing and restful stuff that will hopefully lull him back to sleep. We co-sleep for the first few years, and so having the baby in the bed with us as we slept very much reinforced the night-time is not playtime idea, and it also synchronizes the mom's and baby's sleep cycles so that everyone is likely to sleep more. But even when your baby is in their own room in a crib, you can still teach him that we don't play in the middle of the night. It might be a rough couple of nights, but he'll catch on. I wouldn't suggest keeping him from napping during the day at this point -- he's still very little and needs that sleep. However, if you do get him sleeping more during the night, he'll probably start sleeping less during the day.
I'm pregnant with my third now. My older 2 (7 and 3 1/2) both have an 8:30 bedtime. I think that I will start including the little one in the bedtime routine as early as possible, even if it's only being there and listening to everything without going to bed, and just try to keep things mellow until he's ready to sleep. I know that a consistent bedtime was difficult to establish with the other two until they had consistent naptimes. Then I could start manipulating their schedules to where I wanted them to be, but I haven't had any luck before they start getting on a fairly consistent cycle of their own. I guess the exact timing is different for every child. Anyway, hope that this was at least a bit helpful.