How would I make a characters arms move up and down?

Could someone guide me how to make a characters arms move up and down according to where the players mouse is? (Without using fake arms)

Make an animation and play it..

1. Make sure you have the animation plugin installed on your studio.
2. Open new studio map.
3. Insert the mesh character. 4)Make the animation
4. Upload it
5. Make a script in which binds the character of a player move like the animation.