You will find that frequently people start newbie games for people who don't have much multiplayer experience, many of the people in these games have been registered on the forum for a month or less before playing and experience levels vary wildly. They may even be playing their first game of dom3. A basic understanding of how the game works is pretty much enough to play in one of those newbie games, though in doing so you will almost undoubtedly lose
But don't take losing too seriously in this game, with potentially dozens of pretenders in a single game, just surviving the first few years can be a feat in and of itself.