How to make animations for all models and use them?

[TheOnlyAI]

I want to make an animation for a custom weapon, that plays for first person and for third person, I thought there are skeleton for models and I can just create animations with it and just use it. However, I didn't find anything like this and I didn't find any way to make animations that will apply to player model. I want to make animations first will apply on player walk cycle, second will change player shooting animation in 3rd person, third is first person shooting animation, and run animation. Maybe I can use bones from a random human half life model, but how do I export it to animation file? And also I am using a blender