How do i get started with the development in OHIF viewer?

I want to load the series thumbnails in a specific order and also want viewport to automatically have the first Item loaded in the viewport.

I also tried to read the documentation and struggling to understand it, If anyone guide me regarding this, as to how should I approach the documentation.

I think I might be missing some of the technologies, it would be very helpful if anyone could mention the prerequisites of starting development of OHIF viewer.

You can start here https://docs.ohif.org/