Before you do anything else, you should work in the industry for at least a short time.
A week or a month is likely not enough to wrap your head around the intricate details of the industry, but taking a year, or at least six months, to work at the ground level of the industry can help you understand all the ins and outs that come with the dry cleaning business.
No industry or job is as simple as it appears from the outside, so make sure you work in the industry before you dive in.
Not only will this help you understand the industry, it will help you understand whether or not this is a business in which you would want to spend your entire career.
If you are unable to work in the industry, at least do extensive research. Then u can start your own work.