I am interested in learning about super algebraic geometry (some objects I am studying seem to be naturally superstacks, at least in some sense). What would be the best reference for the subject? I am particularly interested in (quasi)coherent sheaves over superschemes and on criteria for when a global section is $\otimes$-nilpotent (that is $s^{\otimes n}=0$ for some n).

EDIT: I am intersted mainly in places where the theory is developed integrally, so you can have elements in odd degree whose square is 2-torsion but not 0.