Understanding WPMU | New users as ?editors?

Hi there,

I was thinking in make a site that sells sites, but something easy, more and less I would like that, when a new user sign up, to have less options than a normal wp admin.

I don't know if I can do that, not sure If I understood well multisite.

The super admin can add plugins to the network but I cant configure it for the new users, I only can activate or deactivate, isn't it?

If for example I want to have new users not like admins, more like editors, is it possible?

The idea is to have a preconfigurated site, and preconfigurated user admin (similar to a editor profile, with less options that a admin)