At least try it out before, say, quitting your day job. Submit some pieces, get some feedback, go through a few rounds of that. Don't do anything for free, that's horseshit and teaches/proves way less than selling some words.

If your thing's literary fiction then LOL good luck, otherwise you'll probably be fine if you've got a bit of a knack for it, some patience to deal with the business side of it, and can follow directions.