How to create custom dashboard for Firebase?

I have a small project whiсh contains mobile application and backend on Firebase.

Now I'm working on feature that the user can make an order from the application.
And I need to do some admin web panel for operator(maybe a few operators) who will accept orders in real time and doing other actions with it.
What technology or framework is good for this purpose?

I'm mobile developer and have't strong knowlage into web frontend. Therefore, I would be approached by an easier method for create and customize such dashboard.