I'd advice not to expect to sell right off the bat. I have only made one sale on my Redbubble Shop and it was my friend hahaha.. That doesn't mean you won't be able to sell, it all depends on who gets to see your stuff. If you get to show it to someone that's interested, they might buy from you. What I'd suggest is that you keep making stuff and don't stop! That way, even if you don't sell, you will be a master in no time and then you can think of another plan to get people to see your stuff.

Don't give up. I finally started making some coins here in my last posts, and it has been totally worth it.