I found an hidden element in the edit form called "RedirectURIAfterPublish"...I think that's what I was looking for!
The problem in now: how can I change this value only for one content class? So that when I edit instances of this class, the value is cutomized according to my needs.
And since you don't have the node id before the object is published the first time, you'll need to create a module that takes object id as input and redirects you to the url of the main node of the object.