Well, all I can do is tell you what we do.
We started putting Nate to sleep at the same time as his brothers upstairs around 3-4 months old when falling asleep in arms or in the port-a-crib in the tv/play room became too stimulating for him and he wouldn't stay asleep.
My husband is home for bedtime maybe a little more than half the time, so it has to be a routine that I can also do with all 3 by myself. (He always gets hair washing duty though! As well as doing Nate's bath 1-2 times per week.)
6:45pm - snack, go upstairs, play, sing rhymes for Nate, get everything "ready" for the bedtime routine (ie. pjs & diapers out on beds, pick out books to read, clean up, get water cups, etc.)
7:00pm - run bath and brush teeth.
- Ryan & AJ into bathtub, Nate into pjs.
7:15 - Ryan & AJ out of tub, into pjs.
7:20 - read 3 books to Ryan & AJ, Nate plays with toys on our bed.
7:30 - lights out for Ryan & AJ, read Nate his book, nurse to sleep if he wants to, otherwise turn out light and go downstairs (he isn't a big mover yet, so with bedrails he's safe for now; I've already set up the pack & play next to our bed so soon he'll start the night there and come into our bed later). Nate just goes right to sleep by himself