Did you know that even if you don't have a telescope, you can see Jupiter and the Galilean moons through binoculars? Try it.
Callisto, Io, Europa, and Ganymede are all very large and easily visible through binoculars. They also revolve very quickly around Jupiter and it is possible to see differences in their positions even after as little as an hour. Here is a link to an applet that identifies which moons are located where at any given time--
http://www.shallowsky.com/jupiter.htmlIf any of the moons aren't shown, it means they are behind Jupiter at that time.
Jupiter is currently in the constellation Libra. It's very easy to find. Just look towards the south. It looks like a big star, but is brighter than any of the other stars in the sky.