Here's the official UU website. There's lots of info!
This bit (the principles of the faith) and
this (the basic "worship" pattern) may answer some of your current questions.

And
this is the order of service from my local UU group... they have a nice site.
Like pp mentioned, each UU church has a different flavor... there is no specific sacred book, creed, doctrine, or list of do/do nots that each church community must follow. Outside of the principles and sources, each community has a lot of freedom to follow the desires of their members.
Living for many years in New England I visited a lot of UU churches. Some were very straightforward "protestant christian" in flavor with organ hymns, pews in straight lines, readings from the bible, sermons given from a pulpit, even christian symbols in the church hall. Others were similar to open meditation services with soft instrumental music, people sitting in circles or in more "open" seating arrangements, meditation times, and readings from world literature & poetry. Some communities are strongly pagan in flavor with seasonal rituals, others are more humanist, some strongly buddhist in tone, etc. Really the interests and focus of the congregation drive the shape of the service and the type of music/readings/activities since members select their ministers and are very involved in shaping the weekly services.
The UU congregation we attend now is a balance of buddhist, humanist, and pagan. There are a lot of children so there's a very active RE program. There is an organ and pews, but the pews are built in a circular shape surrounding a raised platform (no real "pulpit") and the music varies a lot week from week (there's a musical college near here and we get a lot of student performances). The minister is buddhist and that influences a lot of the readings he selects, but the minister here doesn't always "do" the sermon and when others give the sermon the readings get pretty varied. I know there have been readings from the bible but probably not more than once in the last year? Some hymns do mention god or a creator but I don't think Jesus has ever come up in the music, though I know he shows up in sermons now and then. Like today's sermon was a discussion of non-violent civil protest and Jesus was mentioned along with Ghandi and King and a few others (I was watching littles and missed a big chunk of sermon

). But the divinity of anyone is up to the beliefs of the individual member.... the UU church doesn't have an official stance on the nature of the divine so you're unlikely to find a congregation that routinely discusses Jesus. (though as I said, every congregation is different!)
Anyway, there are several "UU mama" threads around here, and the main website has a ton of info! I hope some of this helps, but if you have other specific questions please ask.

Also, most congregations are very welcoming of visitors so you may want to just stop by one weekend...