Jahirul Amin recently created an awesome book about creating characters in Autodesk Maya, it's aimed at beginners and it's needless to say amazing. I been lectured by him through my University Degree and he was by far my favorite lecturer.
i learned from this https://www.amazon.com/Beginners-Guide-Character-Creation-Maya/dp/1909414204
it has some in depth of character rigging....it helps me a lot