So i've made a video tutorial on how i'm colourising my scanned pencil doodles with photoshop, maybe it could help some people to get the basics and have their own technic in the future. But you'll see, that's really simple, cause in my case, 80% of the drawing is in the line.
So the video shows the process from this
[Blocked Image: http://kokosovar.free.fr/doodletutorial.jpg]
to this
[Blocked Image: http://kokosovar.free.fr/coloured.jpg]
and the download link : http://kokosovar.free.fr/doodletutorial.zip
and that's photoshop 7 in french, sorry 
it was an enjoyable experience.