How do you make shaco work?

You dont.

Max Q for the stealth duration+lower cooldown and build Duskblade before finishing Warrior.

If you want an early powerspike, forego building Tiamat and get Warrior before building Duskblade. You want to make sure you're able to put out enough damage onto your target that'll make them think twice about engaging on you. Also, watch other skilled people play Shaco to figure out the psychology behind how best to place your W.