The "Handbooks and Callings" section...
That's a great reminder of additional help that's available for training newly-called members.
Another thing to mention is that for those of us who don't live in a large ward with fully-formed organizations and classes, the nature of many callings in practice is different for us. I've often been discouraged when seeing lists of things a certain calling 'should do", and then feeling quite stressed because I was trying to fit that list into our local situation (if the Handbook says we need to do something, then we try and do it, even if it doesn't really apply to our member needs). Although many times I've been blessed when following prescribed counsel without understanding the "why", there are times when modifications make sense. So I've appreciated the recent move away from as many specific lists about many things in the handbook, allowing for flexibility and adaptation (with appropriate approvals) when needed.
That said, the O.P. does bring up a good point -- without lists, how do any of us know what exactly is desired from us in our callings? Perhaps the Bishop counseling with the organization president (or whoever the member will report to), could then determine what that leader hopes the member will achieve in their new calling. And then having the leader create a simple bullet-point list that is applicable to their situation, and which they can reference going forward to make sure their efforts are aligned.