I have willowsip and PSR ones. What do i do with them?

Some can be merged with others at the Genetech Lab to make battle scrolls

Awesome. Is there a page that shows which ones? I’m curious if it’s worth it

You can search on SubetaLodge. Each page will also tell you which scroll pieces are used together, and what scroll you'll end up with. The one made with PSR, Willowisp, and Eclipse is Lights of Sprites, which is a pretty reasonable early scroll.