i had a formation on combustion a while ago...it's a quiete simple and powerfullsoftware one time you understanding the workflow... as simple as AE
Btw, there is not a lot of ressources about combustion, dunno why, but anyway you will find some pdf here on the tutoriel's page :
http://www.cgitrainer.com (in french sorry...but i know that's you don't mind
)
If you have some questions, i can also try to answer you