The person in charge of the newbie experience is the newbie themselves.

Honestly. Expecting anyone to do anything for you is just asking for pain.

When I started, I started as archer. First time in? "Hey guys. First time, let me know if I need to do anything, ok?" Outside obvious mechanics like the heads on plates in Qarn, it's mostly "dont stand in this". Couple sentences usually fixes things, and the one explaining for me was almost always the healer.