Is there any way to sell items without owning a shop? I just joined and am still learning how things work.

You can't actually own shops here, but you can trade with other members on the site. You can sell something to someone by making a trade request. There you select what you are offering and on their side of the screen you choose what you would like them to give in exchange. After the trade is sent, they can either accept or decline your offer.

Thanks, this is really helpful!

There's also a synth and alchemy guide to help you price things out :)  It's in the quick links for the Bazaar