I'm trying to understand definition/work out some examples. So, there are some simple questions about higher stacks.

For the simplicity assume that we are working with higher DM (Deligne-Mumford) stacks over $\mathbb{C}$.

- Is there some analogue of Keel-Mori theorem about existance of coarse moduli space for higher stacks?
- It is well known that ussual DM (1-)stacks with a point as a coarse moduli are quotients of a point by a finite group $G$ acting trivially, and coherent sheaves on it are just representations of $G$. So, what are the higher DM stacks, whose coarse moduli is just a point? What are the categories of coherent sheaves on such stacks?
- What are the higher quotient stacks? What are the coherent sheaves on them? For example, what are the quotients of $\mathbb{A}^1$?
- It is well known that ussual DM (1-)stacks etale-locally are quotient stacks. Is there some analogue for higher stacks?