Fire. Help with Particles?

hey guys i had a quick question… im using sony vegas pro 12 and adobe after effects to edit a music video for a friend… he tells me he wants to shoot a scene next week that sounds something like this… a man walks into a room, a room with only 4 walls, everything is pure white. just a pure bright white room with 4 walls… he starts writing on the walls… a time lapse takes place and we see him moving very fast writing and writing and then all of a sudden he stops (we are now back to real time)… he is standing in front of all of this writing in the room… when all of a sudden the walls start to go up in flames in slow motion… a slow moving fire (almost like what you would expect from the begining of a napalm explosion) in slow motion as he stands there and the fire engulfs the walls…

now i know how to accomplish everything up until the point of the fire… i have worked with some pre-keyed effects from "demolition films" but i need this to look proffessional… i would assume i would need to start using particles in Adobe After effects, but i am virtually clueless on where to begin, as i have never used particles before… how should i go about this? and is there anything i should do in the filming process that would make this sort of effect easier to edit in post production?

also, i have found the PERFECT example of how it should look when its done… this is a scene from a movie called "Law Abiding Citizen"… this is literally a PERFECT example… Law Abiding Citizen – Codigo de Conduta – The End – Spoiler – YouTube

let me know what you guys think, any advice would be greatly appreciated.

Thanks,

-Nick

via Video Editing Forums: Digital Director – Adobe Premiere, Premiere Elements, and After Effects http://www.videoforums.co.uk/adobe-premiere-premiere-elements-after-effects/42866-fire-help-particles.html