Questions about Sparta

In my book on Western Civilization they only give a small portion of information on Sparta and they focus mainly on Athens. I also watched the movie Troy with Brad Pitt last night and was not quite sure what exactly is true.

In what ways was Sparta different from Athens? I know that the ground troups and military with strong.

What advatages did sparta offer to it's citizens? My book says that 'Sparta elite women had more sexual freedom than other Greeks.

This I don't get, on how the geograpy of Laconia and the Peloponnesus affected Spartas expansion, unless they are talking about mountains.

How exactly did the Spartans organize the Hoplites and Phalanxes. I think Hoplites where warriors and Phalanxes was the army.