Mentors were removed a while ago, anyhow, from my own experience the only way to get better at role-play is actually starting to role-play yourself, learning as you go along and also by observing others. Joining a player base with a reasonably steady flow of role-play really helps as well, they'll help you get caught up to basics and so forth. Personally, if you're looking for human role-play then Felsen (the Human Capital) is the best place to start, get role-playing with others and eventually join a player base within them, be that the Duchy of Istria (aka Dour Watch) if you wish but there is a fair bit of activity to the East of human lands in Riga or Saltstone.