How and should one start up a Mopar club?

yes and no....

better off finding some mopar guys and getting to know them by meeting up at different events.. an official club is a ton of needless bullshit.

maybe start a facebook page for local mopar guys and then you can see where and when you all may want to meet up.. when they go to join make sure they are in the area. if not keep them out.
I would just enjoy hangin w/ some mature mopar guys, probly not an official club. I used to be a member of the HEMI owners assoc. bac in the day, it was pretty neat. Still got a tank top hanging in the garage.