WoW starter set requires you to have a battle.net account, which means you need to register with blizzard in order for you to play

before login and start playing, u need to make sure the battlenet account has wow enabled (in your case should be starter edition)

mop not out yet, plz do ignore those 'FREE MOP BETA TEST' stuffs in your email, 100% genuine phishing site.

about getting MoP without using $$ part, dream on...

so far the explanation from other peeps has more info (well, almost all of them...)

so far the game itself:

1. requires you to act leet (even if you sux at the game)
2. requires you to strip all your gears off and /dance on top of mailbox
3. requires you to play in barthilas server, then donate every geld u got to a toon named Ris-

* getting beaten up by ex-guildmate for misconduct *