What kind of 'chicken business'. Different things would have different requirements/concerns/priorities/etc.
I guess my biggest single piece of advice, given that you are clearly new to chickens, is START SMALL. Very small. Smaller than you think. Doin' stuff with livestock quite often does not go 'by the book', especially til you have learned to spot trouble coming and head it off before it happens. If you have big problems with disease or parasites or cannibalism, you want that to happen with like 6 or 10 chickens, not with 60 or 100. Not only is it a lot easier to learn to solve problems when you have jsut a few chickens, it is also less of a financial hit if you do not fully solve the problem in time.
And I guess my second piece of advice would be, if this is going to be ANY sort of a business, make sure you have thought through what you will do with chickens as they get older, not just their general fate but the exact logistics/economics of it and of replacing them.
Good luck, have fun,
Pat