Hello,
An admin 'theme' is only going to be as good as the code for your administrative page. In other words, it won't actually come with anything at all. No functionality, just pretty diagrams and charts that don't relate to your page at all.
You'll need to setup administrative users, roles, emails, functions, etc... Things that you can control. Unless you have a backend specifically coded, you'll have to have someone do this for you.