Any Tutorials On How To Make Posing Accessories?

I believe all you'd really need to do is create the object you want to pose with in Blender, and then assign it to the corresponding hand-bone. You can either convert something (with permission and credit) or model it yourself.

Here's a video by the official Blender youtube with some mesh creation fundamentals. Good luck!

There's likely tons out there, check out the channel I linked to see what they have to offer I'm sure you'll find something!