Nextgen – How to create a template

I’m wanting to create a template to achieve a specific look. Here is my goal:

In div (A) I want a thumbnail gallery of albums. In div (B) I want to display the imagebrowser gallery of the first album from div (A). When a thumbnail (album) is clicked in div (A) I want the imagebrowser in div (B) to load that album instead of loading in lightbox.

Next I want to have the imagebrowser gallery open in lightbox if the image is clicked in div (B).

I hope that makes sense. To give you an idea of how it will look, the existing site I’m modifying is https://davidnbrush.com/portfolio.php?data=hinton1.

Once I get this working I have a little more functionality to add, but I need to get the basics done first. Can anyone point me in the direction of a post or tutorial on creating a template like this in the newest version of Nextgen?

Thanks,
Keith