I'd take it apart and remove the rust - I like Evaporust available at the auto parts store, but Naval Jelly or electrolysis in washing soda (not baking soda) will work too. Haven't heard about the strong tea treatment, though.
Then polish up the ram a bit so it moved smoothly, study a good handloading manual, and start turning out ammo.
I don't know about the primer feed, I don't prime on the press. There are inexpensive hand tools that will do a better job.