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The shaman has to be the spiritual guide, provide advice for ethical living, heal the injured, recite the tribe's oral history, maintain the sacred flame, perform ceremonies, and deal with any issues involving gods or magic. Eventually, Jig would have to take on an apprentice of her own, but that's not for a very long time.

The chief, by contrast, has to lead the tribe into war, make new laws, act as judge and jury in disputes (which might be called legal affairs, but its a very crude system), negotiate with other tribes and outsiders, order new parts of the village to be built (including new fields to be plowed), assign warriors to lead raids (he would only lead the most important raids), and to participate in ceremonies which he has to be a part of.

As for the laws themselves, those are created in two ways: tradition since time immemorial, or proclamations of chiefs when they are popular and powerful. The latter is hard to judge, but a new law made in the aftermath of a major victory or during a record harvest is more likely to be considered legitimate than one made after a defeat or a famine. Victory and prosperity are seen as signs of divine favor, and a chief acting under the aura of such favor is likely to have his laws obeyed more than otherwise.