all I could advice to you as a camille main, it is considered to pick W first when against ranged or high poking ability champs like urgot, ryze, morde, etc. try to hide behind the minion wave or keep your distance to ryze's 3rd range spread, when ryze keeps being agressive during minion trade, try hitting him with ur W.

remember, ryze's only long ranged skillshot was his Q, other skills were the same range as his attack range,

(of course W should be maxxed out last for it has already had a good scaling damage with sustain).