Hammereditor thinks that he needs to hide his so special formula for hosting a server, so good luck with getting a lot of advice from him.

Thanks to other people helping me with completing Hammer's information, read and do the following:
If you need to host a server on steam do this:
1. Make a batch file with the following:
@echo off
start Blockland.exe ptlaaxobimwroe -dedicated -steam
Name it "dedicated".
Make a text file named steam_appid.
Put this in the text file:
250340
Put both files in Blockland's Directory.
C:\Program Files (x86)\Steam\SteamApps\common\Blockland (default directory blockland installs in)
Then just run the bat file on a machine, and if you want you can run blockland on that same machine through steam, and it will run just fine!
(if you have alot of ram of course.)
Also, it's highly unlikely that your single server would ever be targeted by DDoSers, its only the big companies and hosting services that people go after. But once again not everyone ddos's hosting services, so dont worry.