I'm an inventor who had this idea for automating indoor pickup soccer, being pretty good at the technical end, I've been able to develop my idea and even have a working model. But I'm not much of a marketer and have no idea how to proceed further. What's the best way to find someone who is more inclined toward the entrepreneurial side?
Not sure if finding someone that is more inclined towards the entrepreneurial side is what you need. As an inventor, you must be very good with the vision, with the creation, and perhaps with the strategy. For that reason I would invite you to take a look at what would things look like if you were to find a partner that is very good with operations as well as execution.
Do you have a particular country / state your desired cofounder must reside?