Council of Elrond

Howdy,

this must be an old n00b question... Situation: I have my avatar in play, sitting at a haven and want to play a character there. May I play the character at a new (untapped) copy of the (same) site or must it be exactly the same site?

I saw it how somebody played it the second way and explained it to me properly but I want to be sure.

Thanx.

And: Must they join at some time?

It is not required that character must be played in the same company as avatar, so it may be other copy of the haven.

Must they join at anytime? Or when could they join?

During organization phase companies may freely join or split.
However on condition must be fulfilled:

CRF, Turn Sequence, Organization Phase, Organizing Companies wrote:Company composition changes that you choose to make, including bringing a
character into play, must all be done at the same time during the organization phase.
During this time no other actions may be taken.