Which camp should I take first?

Hecarim - gromp, then blue for unlimited q's Shaco - stack boxes on red, kills it instantly get q hop over drag, then steal enemy blue with your saved smite (they smited their gromp so its k)

I don't play much hecarim, but I main shaco

There's two routes for hecarim. If you run ghost on him its almost better to get krugs and red first for early ganks and insane damage with an early gank. And then there's the normal farming gromp and blue route (the more boring one).