At the entrance of the arena and just a little west, cut down 2 or 3 spider webs and you will see a lever. The room is shaped like an L. Pull the lever and talk to the guy in red robes.
Above the Duel Arena in Al-Kharid.
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As of (9-7-10), free to play players have not been able to enter the "mage arena" or the "mage training arena".
You can get a Zamorak Staff at the Mage Arena in the wild with lvl 60 mage. Although if that is too hard, you could do underground pass to get a simalar staff, the staff of Iban.
You can access the Mage Arena by going through the entrance next to the Duel Arena Challenging House.
you don't, you get it at the mage training arena
North of Duel Arena Waiting area, you will come across the mage training arena talk to the guy there, he should give you one.
Yes. You get it by doing the Mage Arena mini-quest.
By using that exact spell inside the mage arena 100 times, it doesn't matter if it misses inside there, as long as you cat 100 times you can then use it outside.
I think you are talking about the zamorak cape from the mage arena in the wild.
You can get law runes from the runecrafting skill at level 54, or from buying it at the grand exchange, The Mage Arena, The Magic Guild The Marim rune shop on Ape Atoll, or Ali Morrisane (after completing The Feud quest).
To become a mage on Adventure Quest Worlds, you can either start as a mage when you make your account or you can by it for 1000 gold from Arcana's shop in the trainers area.