More help needed!

Ok, I have this animation where the character reaches in his coat and pulls out something like a weapon, but the problem is how do I make the object appear during the animation?

Also,…

How do I link actions together? I mean I would like to make an animation of my character jumping on say a hoverboard and gliding away but have it as two different actions with seperate controls. Like say I set the jump animation with Keyboard control Key J and the gliding animation with the up arrow, how do I set this up seperately?