We're playing on Argent Dawn / Alliance.
List of dungeons: docs.google.com/spreadsheets/WoWDungeons
I hear it's possible to level completely through dungeons starting at level 15, so we would only play these characters together. You would play something else the rest of the week so that we all stay at the same levels. We log in at a specific day and time and queue as a premade group for dungeons for our levels. It will mean that we will be repeating dungeons though. If you miss a week, you may have to play to catch up to the group for the next week so keep that in mind.
Aberrant: Mage (dps)
Saia: Monk (healer)
Slurms: Paladin (off tank/off heal)
Zeli: Shaman (dps)
Tips I found: wow.joystiq.com/2014/03/04/using-the-dungeon-finder-to-level-in-a-flash/
Tanks: Put a skull on what you're killing.
Healers: Set tank as your forcus target.
DPS: Follow that tank, but get that healer's back.