Just looking at some of the elites, that's probably some of the best advice. They are pretty complicated and rely heavily on reaction to specific occasions from what I can tell. That's not to say it isn't a good combo, but it will definitely take some testing on your part to see what works for you and what you are capable of handling. Like Cike said, testing it out at lower levels isn't going to hurt you at all really.
As for weapons, pretty much outside of Ch/R, all champions will use 2-h hammers. Focus on that weapon mastery, runecraft diversion, runecraft solidify, some on shield form, and probly some in rune pulse. Other attacking skills that you find useful like maybe heavy bash or electrocution. The elites will be up to you to decide what's worth it, I have no experience with Ch/M and I'm not sure how many people have in general, so test em out and see what's good haha.