FRONTEND/ Multisite: Pro Sites, New Blogg Templates, Site Categories, Pretty Plugins...

Subject: Frontend for Multisite, Site Creation, User Creation, Template & Bundle selection

Where is the frontend?

Need: Users visit my landingpage and find beautiful categorized themes, plugins, ecommerce etc.. They want it for a very cheap monthly fee - including support and custom design.

Need front end for this - and my users are below novice lvl in web development.