Frankenmeshing an object

Hi! I've been looking and I'm probably just plain lost, but I would like to frankenmesh an object. In this case, I want to attach the dog ball mesh (I would be recoloring it) to the tip of a magic wand from Realm of Magic so I have a cute wand with a ball on top. I know how to put meshes into the same file (I think that's what it's called?) but I do want to make sure that the ball mesh is attached to the wand so it wouldn't fly over the place.

Any advice or pointing me to a frankenmesh object tutorial would be awesome. Thank you!