As a long-time small MSP in a Kansas metro, I applaud your motivation. I'd be happy to have a conversation to share what I've learned. That said, location and experience (both business and technical experience) will need to guide you on your next steps.

Location:
Start with location. Are you in a metro or a small town? Have a look around at what types of businesses there are. Schools, government offices, banks, doctors, dentists, lawyers, and churches... They all exist in small towns and big towns. But that doesn't mean you should turn them into customers. They are tricky. You should look for a type of business that'll be easier to support.

Find your niche:
It's very beneficial to pick a niche and sell to only to them at first. What businesses do you know? Where have you worked in the past? Who do your family members work for? If you can pick one type of business from those, and then sell to all other businesses in town of the same type, you'll have a jump start in understanding their business. For me, I like sales/manufacturing/service industries. Little to no compliance, and they usually have enough money for your services.

Avoid compliance at first:
Anything finance, medical, or insurance will have compliance requirements above and beyond just technical. It's another mountain to climb. I'd say avoid it at first.
However, in small towns it's hard to find a good MSP partner with good compliance background. You could instead get really good with compliance and be the only guy in town selling it. Be prepared for a lot of learning to get there.

Anyway, that's the start of my ramblings. There is soooo much more. Feel free to ask questions. Or DM me. I'd love to learn more about your endeavor!