You should have all the learning tools necessary in the docs. I have found
only one book so far on Postgres that I liked better than reading the
docs... Greg Smith's Postgres 9.0 High Performance (which even now has some
outdated info, I hear he's working on an update though), and that isn't a
book for learning the basics.
I am also thinking you're connecting to a different server or something
similar. Why not give us some actual errors, or explain in more detail
what is happening?