Ok i searched and didn't find a guide about AoE fire grinding with a mage so here it goes.
Fire aoe grinding can be compared to frost AoEing and both are great, i prefer fire because its faster for me but everyone has their personal opinion.
Talents
http://www.wowhead.com/?talent=oZfVcfR0huiubMstbhc
that's my pretty basic layout and it works well, i can do usually 2-4 pulls before going oom or losing health, with frost i can only do a maximum of 2-3.
Gameplay/strat
Youll want to start on your mount with mana shield optional, pull the mobs and group them to a small cluster than frost nova, straf away or blink and cast flamestrike. as they run to you cast a dragons breathe than instant cast flamestrike and usually finish it off with 1-3 arcane explosions a blast wave or just another flamestrike.
Glyphs
Youll want the blast wave glyph to remove the knockback from it so you can cast it than right after do flamestrike
Vs Frost opinion
Against Frost AoEing in the beginning you will most likely be really bad with it and die more than not, but after you get the swing of it you can take down bigg mobs faster than the standard frost nova, CoC, Blizzard.
Any people want to revise just let me know kind of made this in a rush so might not be 100% perfect.
Enjoy