I see you're interested in selling online! First, inprint has become pretty popular. I haven't signed up, but from what I've read it's "sign up, submit your art, an they'll approve and you can set up shop" but I'm pretty sure they only do SFW.
You could also do out print-on-demand websites like printful or redbubble, but I would also advise make a carrd.co website for advertisement and commission purposes too.
However, if you're taking the Etsy/Storenvy route, you'd probably want to link a companion service to manage printing unless you want to do a local print shop and hand-ship everything yourself. I've seen Gelato recommended for this on multiple occasions.
I hope this helps a little.
Hello, I hope you are having a good day!
First of all I'd like to thank you for taking your time to write such a useful list of reccomendations. I'm going to study these options carefully, this is super helful and leaves me a bit more at ease! I'm definitely creating a carrd as soon as possible.
In my country, most people I've noticed have their own online shop using the same or similar platforms you mentioned in your last point.
I'm sorry it took some time for me to reply. I was still preparing for the con, and then the con itself was CRAZY (positively!!)