The Pope was represented at this council and no decisions regarding faith and morals were approved without all the Bishops, in communion with the Pope, in agreement. So the church was willing to accept the help of an emperor, to listen to what he had to say, but not to accept the rule of an emperor in matters of faith. Constantine did not vote on anything during this council. And to summarize what the Church taught in matters of faith and morals all you have to do is read Creed of Nicea. This same creed is still recited today.
Now, what about that Arian heresy? What did you guys do to refute it and where can I read about it?