Bought a house the brick is gray does almond trim windows and gutters match this color
White would go well for gutters and trim. Since the brick is grey I would go with a black door and black shutters... Have fun!
Yes. That would be attractive. Suggest you paint the front door red.
I would chose white trim with a red door. Just my opinion though(there is a red paint made just for outside entry doors)
black shutters ..like the red door too.