Cargo van owner operator and using load boards vs. dispatch companies?

Hello all, newbie here to the industry but trying to learn the basics on becoming a cargo van owner operator as a potential part-time or even full time gig.

From what I’ve seen non-CDL drivers can use load boards like Sylectus but it seems like they are usually better off partnering with reputable dispatch companies that can give consistent loads. I’m aware that cargo vans are usually more profitable for last-mile courier delivery but I’m more interested in OTR for now.

Just trying to get a non-biased look at how possible/impossible this opportunity is, in particular if partnering with the right dispatch company is a key for success. Many thanks in advanced.