I can agree on yellow flag.I would suggest making a start in a random city. Then the population would be spread evenly. Those who know the game and so get to the right place, and beginners will be able to cooperate in remote places. If they need to get to some other city, they will have a goal / incentive to learn how to cooperate with other players from this zone. I also think that chat for noobs is a very useful thing, as well as tutorial. Yellow flag for noobs not bad thing too.
Very first experience is birth, next is survival. If you don't succeed, the reward is death to find the light. Very simple