Getting a routine

How the junk are you guys getting your baby to get into a routine? I feel like my LO just does what he wants and I can't really do anything about it. If he wants to sleep, he'll sleep. If he wants to be awake, he'll be awake. When I put him down I never know how long he'll be asleep for and so I never know how much sleep I'm going to get, which usually ends up happening during the better part of the day. Bathtimes aren't necessarily relaxing for him, so I haven't tried making a nighttime routine of it, or of anything really. He's my only one and I'm a stay at home mom, so it's not that big of a deal, but it'd be nice to function during the day like a human being.

Anyway, sorry that was a bit of a rant, but what are you ladies doing to get a routine established?