I was a "solo founder" type for awhile. If you're an engineer I think you can have your pick of co-founders.
My suggestion, after working on and for startups for a couple decades is that you should be the CEO, find business people to be co-founders, and hire a VP of engineering, or CTO.
It's almost a cliche that there are business guys "starting companies" who "just need an engineer"... but I think the best chances for success - on a high tech startup - are for the engineer to be the CEO, and eventually bring on a CTO.
One advantage of this- the CEO is focused on product while the business guys (COO, CMO, whatever) are out doing the legwork for raising money. I've seen too many companies flounder because the CEO was focused on raising money.
You can learn business, they can't learn engineering. (well, they can, but not to your level in the time available.)