Like every business, you have to pick a target, assess your capacity, and learn a lot. Money questions are secondary.
First determine what kind of business you want (repair, selling, old watches, used watches, new watches, collectible watches, which brand, for what kind of customers, where, ...) and what could be your added value. BTW, these last two words take years to build, becoming an expert, a repairman or building a professional network/reputation is not easier in the watch business than anywhere else.
When you have answers to these basic questions you can start thinking about money. Until then, it's pie in the sky. From your first post, nobody could tell you much, because it looks like you are still unclear about all this.
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