Install a degarca (tsoida season) server through the Control Panel (Servers → Select your server → Game servers → Add Game Server → degarca (tsoida season))
Honesty, its the best I've used and pretty easy to navigate. Adding mods to my servers haven't given me any problems. Sure there is a cost to having a server but I'd rather pay than dealing with a free server that lags me and my friend every few seconds or running a server completely dependent on me and my pc.