Gambling requires money to deal with. If you don't have a source of income, how can you cover your purpose of turning gambling into a career? You have to risk your own money in gambling before expecting good money in return. Each of your actions was associated with risk.

To summarize, to make gambling a profession, you need to rely on your own skills and use that as an advantage. Know where you're good at, sports, card games, and anything. Compete with others and test your skills. If in the long run, you were able to use that talent and skill of yours as an advantage then you can slowly start turning gambling into a career. You should have already had a good experience at that point.