If you're looking to make a profit from your photography, then you need to find out what people will pay you to provide.
Study trade magazines for the industries you want to supply. Look at the pictures used both in the adverts and in the editorial. If your intentions are towards retail customers, find out what existing photographers in your area are doing and first copy then try to improve on that.
Professional photography, in my opinion, has always been 90% business nous and 10% creative ability.