At about 8-10 weeks we just started with a bedtime. So upstairs with a bottle at 6pm and then pop in their cots (twins) - we didn't do a bath every night....because twins!
They were very good sleepers/self settlers right from the start, though (we used to have to wake them to feed them for weeks after they were born). And they pretty much dropped straight off to sleep once in their cots, so we didn't have to do controlled crying or anything, then we came up to bed at 11pm and gave them a dream feed. Then we pushed the very early morning bottle later and later until they weren't waking up for the day until 6am, which is when we get up anyway.
During the day, we fed them every three hours and at this age all they ever did was sleep between each feed.
As they got slightly older, maybe 12 weeks or so, I think that was when I started to be a bit more organised with naps, originally 4 naps a day between feeds. This dropped to three naps quite quickly, and then two naps around 6-7 months.
I always fed them every three hours during the day, right up until they started weaning and began to drop feeds naturally. It suited them, but it might not suit all babies.
So, basically, start with bedtime and then the rest of the day tends to naturally sort itself out soon after.