Adding a Admin Interface to devise

Hi there,

first of all: I'm pretty new to Rails, so please don't blame me if I ask a stupid question :)

I use devise + cancancan for authentication and authorization. The user model is already generated by devise (inluding the views). Now I want to disable public registrations. Only admins (cancancan role is admin) should be able to create and edit users (e.g. list of users with edit button). How would your approach look like? I'm totally lost with that :(