It's wildly varies depending on "how serious" you intend to take up with it. A "reseller" provider just literally need the admin and marketing down. While someone with a "unmanaged" VPS/dedi is gonna need sysadmin, security and so forth knowledge to boot.How much knowledge do you need to run a hosting business?
Yes but let's be honest do you want to deal with someone who doesn't know how even DNS works to help fix your issues? Or someone more adept and knowledgeable in the field?Could someone with not much technical knowledge about servers and stuff run one?
I may not be a seasoned sysadmin (thus why I opted for a Managed Service Provider (MSP)) But I am knowledgeable with web hosting itself, made the knowledge base articles and helped my few clients on multiple occasions. With only needing to contact the MSP twice for largely system level concerns.
Therefore I am not one of those "guys" where your waiting days because they got absolutely no ideas what's remotely up.