Talk about some amazing advice in this thread. I wish I had some of this guidance when I started my guide business. Instead I learnt the hard way through trail and error.
Mike, here is the down and dirty. Plain and simple....
There are a handful of guys I know who are true "Pros". Sure they can catch fish, but more important, they make you feel like an ole fish'n buddy after the day is done. That was always my goal guiding and itmade us quite successful.
Basing this whole business venture on average fish boated is very very bad business.
So, if you are prepared to invest thousands before seeing a return, have taken small business courses, ready to take all the courses and get your proper/required licenses, have 5 or 6 back up plans for each body of water to guarantee fish, diverse quality gear and have above average people skills, give it go.
But to be honest, really research the COSTS. It will open your eyes. I guarantee it.
Not trying to discourage, just sharing my experienced viewpoint.