Requirements:
66+ Magic Level
Some money to get started (you will gain it back and more)
Completion of Heroes' Quest (Not required but recommended to charge Amulet of Glory)
43+ Prayer (Not required if you can withstand hits from Black Demons)
What To Take:
Staff of Air
Cosmic Runes
Unpowered Orbs
Amulet of Glory(Not required but recommended for quick banking)
Weight Reducing Equipment such as Boots of Lightness, Spotted Cape, etc.
How To Get There:
Start in Edgeville then go south into the broken building by the Yew Trees. Take the ladder to the Dungeon then follow the route in the map below.
Once there cast "Charge Air Orb" on the Air Obelisk near the ladder. You will receive 76 Magic Experience per Orb Charged and a changing profit. If you brought one use an Amulet of Glory to teleport to Edgeville and bank. Then repeat.