I sit and struggle to get a multi-site network up

Hi.
I sit and struggle to get a multi-site network up and running. When a user register a new page, super admin can have a template for the new page. With preset sidebar, theme, menus, etc. I want that my users do not have to self-organize their site. It should be as easy as possible.
Is it possible to create a template for newly created sites?

Best, Tim