You have to code them yourself, connect to the servers via tcp and just send packets. (Not as simple as it sounds tho).
Also, 1 IP = 4 bots at a time, so your guess with the proxies is true.
Depending on your coding skills you can either start from scratch or use one of the proxies (Krelay / n-relay) as a code-basis; don't use them, just look at theire code and recycle parts as needed.