Buy Arma II and Arma II: Operation Arrowhead OR Arma II: Complete collection.
Install and run once.
Go to or google the http://www.dayzcommander.com/ download, install and then install the arma II beta patch plus the epoch mod.
Do a search on servers for Deviantedge. Join and have fun.
Any problems contact me Quebber via skype calranthe or steam pyrso