For non pro work norbar are fine, as has been said one for low and one for higher settings. New to BMW engines etc,but would imagine certain fixings may require angle torquing and the Snap On wrenches with digital settings can do angles,or a cheap angle guage can be found on ebay.
Whilst on this subject,working on Daimler Benz commercial engines we encounter a lot of stretch bolts that can only be used once,and then replaced, I would imagine that certain BMW bolts are similar.
If unsure about torque values there are plenty of charts on the Internet with basic settings for bolts of main metric sizes and tensile strengths. Various theories exist concerning the use of a lubricant on the thread pre tightening,as an apprentice, many years ago torques were always stated " with wet thread" the thought being lubrication of the thread made for a more accurate setting.
Certain modern bolts,if they have a silver finish should be fitted dry,as the coating doesn't like the addition of lubrication , as should use of a locking agent be done carefully,especially in aluminium bodies,and where its not practical to apply mild heat to ease locking agent,on our German built machines a two part product is used,I wonder if BMW use similar?
Sorry to ramble on,but I see lots of damage caused by incorrect fitting of fastners.