Buy a book and experiment. Books by Barbara Brundage, Scott Kelby, or Phillip Andrews and the "Dummys" series are all good and easy to learn from. Borders sells them all.
The program is simple so you should have no problems.
Like most programs, 90% of the time you will probably use only 5% of the features so first concentrate on the basics and the rest comes easily with the help of the books.
