I’m afraid I don’t have a concrete answer to either of those questions. I can’t really remember back to a time when I wasn’t drawing, although I took a break recently. I know everyone hates hearing it, but there’s no secret to art beyond a lot of practice…which can actually be inspiring depending on how you look at it. I’d say if you want to learn to draw flowers, there are plenty of books that might help (Botany for the Artist is sitting forlornly in the corner of my room). Or you can just start doing it! Buy (or scavenge) a bouquet and photograph it to bits and then just doodle away! That’s my tactic.
I’m not a florist, so I can’t offer advice there. I just started buying bouquets in the grocery store to make crowns and ended up finding a lot of joy in playing with flowers. I think if it’s something that makes you genuinely happy, then you should pursue it even if it has to be on the side for a while. Real passions often have a way of consuming your life, in the best way. Follow inspiring florists like Moon Canyon, Siren Floral Co, Amy Merrick, and Alea Joy. And if you want to know more about the practical aspects, maybe you should try talking to my lovely friend, Paige (vacillavi).
I hope that was at least a little helpful, and let me know if there’s any other way I can help you on your floral path. :)