Self Employed Ksiegowosc Self-employed?

Self-employed? - self employed ksiegowosc

I wonder if anyone else is independent, ie washing cars, pet care, lawn mowing, etc.
I am looking for part-time job, and I thought it would be a good idea, but do not know how. How is it profitable? How do they do it to an income like that? I would be very grateful for some ideas.