First bit of advice-- Join AO’s Discord. It’s way more active then here or FB. There’s an invite link in the launcher. Mostly mature friendly people.
Docs are always in demand but they level slowly due to not great dps-- you outlast the mobs. MP’s are a bit easier to start with imo.
AO Universe is the Main site for AO info:
and for running around newbie isle the first few times I always recommend the Arete Quest list for some strange reason. 
Welcome to AO!