Ithelak is only one of three worlds. The other two are Alronia and Cordime. They do not exist in the same plane, in fact, they are each in separate spiritual dimensions, so to speak. The name of all three together is still being created (it isn't a... regular word), so for now I will call it IAC.

When one is born in IAC, he is born into Ithelak, of two parents, like in Earth. He lives, he learns, he dies (generally he dies, though there are a few exceptions).
When he dies he enters the Wraith-Realm as a wraith, he travels to Alronia (or lingers for a time in Ithelak, as the situation goes). Then he selects a new body, a dwelling place for his spirit. He exits the Wraith-Realm and enters Alronia fully then. He lives, he learns, he dies.
And he again enters the wraith-state to travel on to Cordime. He enters Cordime and finds his Name. Once he discovers/learns/creates it, he ceases to become a wraith and enters the life of Cordime. In Cordime he lives, he learns, he dies.
When he dies this time he has finished his course of mortal life and goes on to the spiritual world, his wraith and his bodies being left forever behind him as his spirit goes to either join God in heaven, or to be banished from His presence in eternal torment in hell.
That is the overview, there are many more details, of course.
Please understand that this is not a system of reincarnation proper: it is merely a segmented life. Imagine a person who lives his youth in America, gets married and moves to Africa, then in his old age after his children move out he goes and lives in Asia, where he finally dies. This is like that. Each 'death' is merely the passing of the person from one part of IAC to another. One must still be saved, and one can do it any time during his entire life-span in the three worlds.
Each of these three worlds has their own cobha, and their cobhas are interweaved or founded upon each other (not in the same way as Triterrus, though).
I will write another thread on the differences between their cobhas and how they relate to each other. This thread is focused on the Path of Life.
