Shadow Gunner rotation?

[Fortunaea]

Hi there!

 

I recently made a shadow gunner, and was wondering if anyone could give any pointers on some good ways to play it (PVE style preferably) and what the best rotation is?

I currently have undying badge - won't be the final one but It's what I've got for now.

And any other gear focus advice, like what shadow should upgrade, is welcome.

 

Thanks!