Invoking a god you don't have a relationship with can be dangerous. Especially a god so powerful as Zeus. DruidicMage is right. You shouldn't do an invocation for Zeus.
I would set up an altar, Set out bread and honey. Incense like air and jasmine. Cinnamon sticks, too, and ASK him to come to you. I would set up this altar for 7 days, and see if He is appeased by your offering.