The two key environments where renting bikes is a natural are in recreational tourism areas and cities. A short questionnaire initiates the process.
Collect the resumes of the people you plan to put in charge of running your business. It all depends on what your personal interest is and what skills you want to employ in your business.
For example, Los Angeles has a dense population. The startup funding for boat transport is modest but perhaps surprisingly higher than you might think, especially given the cost of pickup trucks.
Bicycle stands around the city allow riders to rent a bicycle in one place, ride to their location, and drop the bicycle at a stand near their destination. You can provide all the service yourself, from scheduling to driving.
If you discover that improving on the service will not give you much of a competitive advantage, then you may need to scrap this idea.