For a positive impact, does that mean I need to charge money? Maybe if all other means of income and expenditure are taken care of, or maybe if you can afford it part-time.

Not charging money means you can put more love into it, I guess. Or you truly are doing it for love, and you don't do things to line your pockets.

Genuineness. Honesty.

But realism and responsibility comes first. I guess if you have these covered, it should be ok.