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Bluanimal and I are the resident Wukong players to talk to here on Neo, so you can ask us on him. Blu is more knowledgeable on him though, simply because he plays top and I...don't. 
My build for him varies a lot. I start Cloth+5 pots, Doran's Blade, Doran's Shield, Boots+3 pots, or some other situational things.
Remember Trinity Force rushing is a good idea when you are ahead, and not a very good idea if you're behind.
Black Cleaver is amazing on him, and Frozen Mallet/Sunfire Cape are both very good. The most underrated item on Wukong come late game in my opinion is Randuin's Omen, it makes his team fighting even scarier.
Wukong can build tanky or damage and be really effective either way, but you'll fall flat on your face if you build the wrong thing for your team, keep that in mind.