Welcome (back) to rescreatu!
As for goals, they differ from person to person. Like myself, I like to collect as many nice Pokemon and RWN (Real word names) as I can. Others like to collect Retired Credit Shop pets, or fill creatu collections (there is a log under information of who has how many of what pet).
Most goals revolve around "I want to be the number one Jaaku collector!" or something to that extent. Others just want to make as much tu as possible and hoard it all or give it away once they get to a certain goal.
It all depends :)