Hey Leon,
I think you would at least need to get your hands on this first:
Very good tool.
However, although I do not know your experience with DBC and M2 files, I would assume you are quite new. My best advice to you would be to start very small at first, and then take on bigger tasks. I think there are some tutorials around, but in my opinion, I think it is good to work easy and not stress yourself with too hard tasks.
Oh and btw, I found this old utube channel: https://www.youtube.com/user/PhilipTheNoobModder/videos
Try and check some of the videos out, they are old, but they give good insight in retroporting
Hope this helps a bit