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The council did not form the Bible.. They correlated the already existing books and letters that are in the Bible.. 66 different books where brought together and declared the inspired word of God...
Never heard that the Council of Nicea played a part in forming the Bible. Here's what I found on wikipedia:
https://en.wikipedia.org/wiki/First_Council_of_Nicaea#Biblical_canon
There is no record of any discussion of the biblical canon at the council.[67] The development of the biblical canon took centuries, and was nearly complete (with exceptions known as the Antilegomena, written texts whose authenticity or value is disputed) by the time the Muratorian fragment was written.[68]
In 331 Constantine commissioned fifty Bibles for the Church of Constantinople, but little else is known...
Appendix of NWT:
http://wol.jw.org/en/wol/d/r1/lp-e/1001061203
Awake 2007:
http://wol.jw.org/en/wol/d/r1/lp-e/102007409?q=%22How+the+Bible+Cam...
How the Bible Came to Us