The key is to bring a woman with you into the industry, produce a portfolio of quality work with her and then to methodically branch out to other female performers and build your personal brand and reputation that way.
If you just show up with your dick in your hand, no one is going to care.
Pretty much. The only other way he could possibly get a head start is by being exceptionally hung (say, 25 cm or over) or showing proof of being an exceptionally good performer. Like, recording himself with a couple of girls for an hour or more of vigorous uninterrupted sex and cumming on command, or something. Which is something very far-fetched for a guy who's not involved with an Onlyfans/porn star to begin with.