I'm an actor- mostly theatre. I've VO'd a handful of TV commercials. I am not a successful voice actor. It requires as much dedication, training, equipment etc as any career.
I would recommend two things.
voice classes and books in the tradition of Cecily Berry. You'll also want to look into some phonetics/IPA work as well. People will expect you to know - for e.g. how and why a southern accent diphthongizes the vowels and which vowels it shares with GenAm vs RP.
music / sound production. You may be expected to do your own noise removal, normalization, amplificiation and limiting.
not to dox you, but if you gave me your nearest major metropolitan area I'd be happy to look up which voice classes seem like they could be legit as a starting point.