I would check out Babywise. You don't have to do everything in there, but they have great schedule advise. Eat, Play, Sleep, about every three - four hours or so. I think that they recommend naps between 1.5 - 2.5 hours (helps them not confuse night time.
You can fit the bedtime into your schedule as you need too. As a working mom, I HATE the early bedtimes, but my son does now need it. Is your son sleeping through the night? If not, then having the bedtime later isn't such a bad thing. As he sleeps through, you can move it earlier and earlier until he gets his 12 hours.
As far as a bath, I think at that age, I was bathing only once a week. Even now at 22 months, I only do about twice a week.
For the earlier bedtime, do what you think is right. Is he sleeping through the till the normal morning time when you put him down early? If so, then he may need it.
It takes a lot of work to get a schedule going. Feel free to contact me if you need a suggested schedule, as my son has been on one since he was born....I LOVE it, and he thrives on it.