CNC Machining my Model

I am trying to create fishing lures designs so I can upload the model to a CNC machine in order to machine out a mold into aluminum. It will be a cylindrical type worm lure that will be made of soft plastic. My question: should my model by hollow or completely solid when I upload it into the CNC software? Also since the mold will be two halves of the model how should I deal with splitting the model in half (one half for each piece of aluminum)? Just for a visual here’s a sample of a mold I’m speaking about.

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