I read lots of business books, every book by Bannatyne, Branson,and Dennis (he's the uk's richest man- went to jail as publisher of ozz- and hit the big time when Bruce Lee died because he had the rights to loads of pics and rushed out an autobiography, then magazines, then calenders.Later he launched a computer magazine)
Gordon Ramsey is a good business read, and to a degree chris evans.
I also like books about business theory and marketing.One of my favourite books was one hundred brand disasters.
These books have informed my window cleaning career and i usually take one on holiday and come back fired up.
As regards tv biz progs, well kitchen nightmares is great, and i like the business inspector lady on chanel five.
Most of the people i mentioned are serial entrepreneurs.They spend their time looking for opportunities. Window Cleaning is an opp but it's not on their radar it can provide a good living but it also has faults- such as a low barrier to entry.For anyone who is interested here is a skeleton of how to make money by starting a business.
1. Address a need
2. Present it in a novel way
3.Tell people about it
4.Find a way of adding value
5.Look for repeat business and a path to expand.