Cable delivered via wire is considered to be a natural monopoly that in the united states cities (or other sub state level groups) grant one company the rights to string cable i.e. the Cable Franchise Fee. Running a second set of wires is expensive, and simple economics are going to have every existing cable company keep you out of their system. Google's fiber is the one set of to the house pipes that MIGHT let you use them. So unless you have lots of money doing it the "industry standard way" isn't going to be possible.
So long as you're tied to using wires cable systems are local monopolies and capital intensive, figure out a good way to bypass this any you may have a good business.
Go look at Comcasts financial statements if you want to see what the cost structures are. Note they're spending 13% of revenue on Capital expenditures. In 2011 they spent 40% of revenues on Programing ($19,625 in video revenue,$7,870 on programing).
http://www.cmcsk.com/earnings.cfm
Second, figure out if the content providers will even let you have the content.
Cable is a big market, a business that could disrupt it would do well.