How many artifact lands can I play a turn?
Artifact lands may be artifacts, but they are also lands, and all the usual rules about how often you can play and land (i.e. once a turn, on your turn) still apply to them.  The same goes for creature lands like Dryad Arbor from Future Sight: if you've played a land already that turn, you can't then play your Dryad Arbor.

If you want to dump out a ton of mana production on your first turn, you're going to have to invest many thousands of dollars for a large collection of Moxes, I'm afraid to say.

From the Comprehensive Rules, section 305, Lands:


  305.2. A player may normally play only one land during his or her
  turn; however, continuous effects may increase this number. If any
  such effects exist, the player announces which effect, or this rule,
  applies to each land play as it happens.
  
  305.9. If an object is both a land and another card type, it can be
  played only as a land. It can't be cast as a spell.


Essentially, the fact of an Artifact Land being an artifact doesn't mean it is no longer bound by the rules for lands; it must follow all the normal rules for lands, and all the normal rules for artifacts too - so it is a valid target for Shatter, and so on.