Help! Where do I begin?

My kids have watched anime for years, but I recently learned that their favorite is Scout Regiment. I’ve never followed any of this before and I’m trying to figure out the best way I can try and learn more (search results are overwhelming!) so I can randomly drop some comments that catch them by surprise.

Can anyone give a noob some pointers?

edit: So much love here. Thanks for all the feedback. I’m diving in… wish me luck.