See this page for a few links:
http://mamewah.mameworld.net/help.htmThe only current turorial is in spanish...but JCrouse's example ini files are a great place to start - it helps to have a look at somone else's setup.
If you're not in a hurry, there should be some more docs coming out in the near future. BTW I am also working on a new version, so it might pay you to wait for that anyway. A Beta of this is available at the ArcadeOS / Mmewah board (see topic in this board for link), and a final version in a couple of weeks - I'm about to go on holiday
