FWIW we have some links to old texturing tutorials here. A lot of these links might be dead from bit-rot though http://wiki.polycount.com/wiki/TexturingTutorials
I'm not sure what you mean, but of course there are options to bake metalness and roughness. Certainly in 3ds max, and I'd be very surprised if it was any different for Maya. I'm repeating some things others have already said, but metalness and roughness, while general concepts, are in the specific application you are…