Tones of good material exists at the Maven2 site:
Another very good place where to find information:
To search for free jars (very useful)
It is kind of difficult to start, but it worth the effort.
I cannot imagine to start a project without Maven + Continuum
It is also possible to use [mavenbrowser.com|http://www.mavenbrowser.com/].
It gives you information about pom snippets. It also has alrady a lot of repositories which is scanned.
And it helps you with analyzing your dependencies and gives you some advise about that.