Hi,
The direction and exact degree of your front door is always measured standing in the front door facing out into the world.
To find your directions in the room you need to stand in the middle of the room. If the room of an L shape there are two options. The first one is to draw your room and add the missing directions in order to make it a rectangular. Than establish where is the middle (it may be outside your room) and measure your directions from there.
The second one is to divide the room into two rectangulars and activate the directions separately in each one of them (I am not sure how practical it would be).
We never activate feng shui in the bathroom. Bathroom, WC, kitchen are the areas where energy actually disappears. If you activate your directions there, it would be like consciously saying to the Universe that you want all the opportunities to go down the drain.
It would be good that your bed is in one of your personal directions. It means that the headboard and the top of your head should be directed towards it.
Energy numbers and elements are interesting options. Personally, I think that one’s inner development and wisdom will make more difference than a perfect element or number match.
Google maps are helpful if you want to look at a plan of a town.
Good luck.
Alexandra