Cloudflare DDoS Shield Setup

My multiplayer game currently runs on a VPS that is being singled out by DDoS crews. I need the traffic to flow through Cloudflare so the real VPS IP never surfaces and attackers hit the edge network instead of my box... (Budget: $250 - $750 USD, Jobs: Cloud Computing, Cloudflare, Computer Security, Game Development, Linux, Network Security, Ubuntu, Web Security)