Front & Back of the house

Dear Master Cecil,
I live in a 2 storey terrace link house. My front main door is facing left side, a high wall sharing with my neighbour which is 7 feet apart. Is this bad feng shui? Can I place a small water fountain here to face the main door (distance is only 7 feet) and also to reduce the bad effect of heavy metal as we usually park our car here.
At the back of my house, there is a 4 storey building (40 feet apart from my backyard), there is a drainage between the 4 storey building and our backyard. The drain is very small but it was widen and deepen to avoid flood during heavy rain. So far, even is during heavy rain, we hardly see the water level raise above the small drain. On this drainage system, there are tall trees and bushes growing. My question is whether it is good or bad with such structure behind my house.
Is car porch, verandah and backyard to be considered as part of the house (if it is attached to my house with roof top) when I impose flying star chart on my layout plan.
Thanks & regards,
Fiona