I'm new to selling my art and services online, but the thing that spurred me to start was finding out that applying for a New Zealand residency visa costs $5000! The first thing I did was open up a KoFi shop with commissions. You can see examples of my work on my website, and order commissions either through there or through KoFi.
(of course, if you feel like helping me out, feel free to buy my a coffee!)