Sorry I'm pretty new to the engine, but I'd like to figure out how to add a new weapon to the CE3. I've downloaded a .pak file flashlight (weldable object) how would I install this so it's selected in the equipment selection?

.pak-files are typically placed into "Game"-folder.

How would then I select to use the object, and all of it's animations, and whatnot?

Items contained in pak-file should be available in objects browser in RollupBar.

No what I mean is how can I assign it as a default weapon to use. The object is a flashlight so how can I make the light, and the animations all compatible with the model once it's assigned as a default spawning weapon. I know how to assign a equip pack as a level start via FlowGraphing already.

What's the download link to the asset?

Im getting an invalid mesh error now when I try to wield it.
Anyways here's the asset file
Torch Flashlight Weapon as featured in the City Decedere Mod
Here's the mesh error message.
http://i40.tinypic.com/zvo16o.png

Asset is made for CE2 and also includes custom animation setup, which means it cannot be used in CE3 without major changes.