Make some kind of quest that players can do to gain something from. The will understand the game easier.
Why not make an, independant from the game, interactive tutorial?
Task 6: Reach a dpa of at least 5 (Quest should come up x hours before protection ends)
This one gives me a suggestion idea : i think it would be good for newbies to have a stat in the manager called "Global Average DPA", which would be the average DPA of everybody. This wouldn't help the older players much (altho i can already think 2 potential minor use for it), but it would tell the noobs if they're grossly underdefended.