Getting a game of noobs on either Vassal or BGO is nothing more than a crap shoot. You can list a game as a noob game but you are still relying on the honesty of the players who are joining to be actual novices.
Nothing against Vassal but for lots of reasons BGO is the way to go when playing TtA. Give it a try and let me know if you post a game to BGO, I will join.