You're not offending anyone here. It is excellent that you've come to a place like this to learn how to not make a mistake in obtaining the artwork you want.
Now, in order to clarify; "black and grey" is generally spoken of as "realism" - mostly like non-color photographs. There is also "blackwork" which is mostly just black (and a wide range of sub-styles therein).
Slow down. Stick around and read posts for a couple of months. Drink in the pictures and the discussion on the board. Educate yourself to the process, the styles and the artwork. Wait and see what resonates with you. The journey is fun.