Since it's a business, your efficiency in the darkroom is of high importance. However, it is just one consideration among a whole host. The most important question is, are you doing a business plan? You really should. Use it to tie all of the considerations together into one easy to grasp bundle. Actively seek out every possible reason for failure, come up with a behavior to counter it and put it into the business plan. Decide ahead of time what will cause you to quit.

Best of luck to you.