I want to install my ceiling fan which has a light but not sure about what wires connect. The fan has 1 black, 1 blue, 1 white and 1 green. My ceiling box has 2 white, 1 black, 1 green and 1 copper (no coating). What goes with what? My installation instructions don't have this configuration. I think I have a extra white wire but where do I connect it? Thanks for your help.