Help me please?

still a little bit of a coolant leak

When you replaced your old gasket with the new,were you careful lining the new gasket up?Sounds like you possibly got the gasket in crooked.

white smoke from the exhaust and smoke under the hood

The smoke from under the hood is coming from the anti-freeze leak and the smoke from the exhaust is most likely from gettin some antifreeze into your intake,that will burn off.