Yea pretty much
you just upload the file and then choose which products you want to make it into. You can edit them to match things like tshirts etc.
There are no creation fees or joining fees like etsy or ebay but they deal with everything and just give you a percent. For instance, they sell my stickers for 1.58 and I get 20p per sticker. However, you dont know who buys or anything and they make and send it all. You literally just upload and wait
Good luck with it, I have found it really good so far. I have sold 14 stickers via Redbubble and then sent 5 off Etsy so you can see where the art really sells.