1. If I change from lvl 30 Thaum to an Archer.
Does my archer start at lvl 1?

2. If I then get my Archer to lvl 15 how do I know I have a Black Mage as an option?

3.Will my Black Mage start at lvl 1?

Last question/s are about Attribute points and how they work.

4.Attribute points. I have heard each class has their own separate set. So my question is, aren't the points utterly superfluous? (As in, they could just as easily be given to the most useful stat to your class).
I say this because no Archer is going to put points into Piety. And no warrior will stack INT.
It seems quite obvious as to the choices you will be making. So why even give the option?

5.Also, if my Thaum has it's own set of points to allocate...and as an Archer he also has his own set of Archer points. What happens to me when I turn into a Black Mage? Does it take points from the Thaum and Archer? Or will he have his own set of points to use?

Thanks