In my studies, what I have learned is that the Bible as we know it today was started to be put together shortly after the Council of Nicea, the main charicter in the assembly of the books was a bishop named Irenious. It was not fully assembled as one book until somewhere in the 400's ad. At that time it contained some of the books that are now considered gnostic, these were dropped somewhere areound the 1400's. The catholic bible still contains books that the protestant bible does not.
Now an interesting note is that Irenious was a Trinitarian, and the person that was called the Church Historian, Eusebius, was an Arian. Consitintine was actually nutral in the matter of the trinity, but was influenced greatly by Eusebius. Constintine wanted to settle the infighting in the new belief and so called the council of Nicea. He at this time became under the influence of Irenious and accepted the trinity, and as well Eusebius accepted the trintiy, although he was said to be one of the last to accept it. Irenious did most of the work on assembling the Bible, Now he as stated before was a trinitarian. The interestnig part is that the JW's and a few other sects of christainity try and use a book that was assembled (and some possibly written) by a trintarian to show that the trinity is not true.
Seedy