Short Answer
What is God the source of?
What is everything that is perfect, all perfections in the world, source of existence, etc.
The Universe created itself.
False - the universe came into existence out of nothing, then it would need a cause outside itself.
God is Omniscient.
All knowing, he knows all real and potentially real things, knows everything true now, past, future.
Why do we refer to God as Father?
First origin of everything and transcendent authority.
He is goodness and loving care for all his children.