Rig this Clone I Appended to the Scene?

(Note: I downloaded a non-rigged model from the web. Credit goes to the original creator of the model.)

So, I just appended a clone trooper model into a scene, and I would like to rig it. Is there anything I need, such as Rigify, to make shape keys of the hands, feet, and head?

I would like to create an animaton with the clone, and to do so, I need it rigged. How do I do it with Rigify? Do I make an Armature for the model first and place the Armature around the body?

Any tips and/or advice? Thanks.