Where does GOD come form?

Well, it depends on what you mean by "God". Presumably though God has just always existed, he exists outside of time and is all-powerful, at least according to the bible.

Well the apostle Paul referred to God as being the "King of Eternity". (1 Tim 1:17) So God has no beginning and has no end. He has always existed and will always exist in the future as well. Revelation 1:8 puts it best when God says "I am the Alʹpha and the O·meʹga,” says Jehovah God, “the One who is and who was and who is coming, the Almighty.” This can be really encouraging knowing that God has always existed and he knows everything especially how to care for our needs