Hi and welcome to the site. I recommend taking some time to browse the top rated stories to get an idea of what's possible and the quality level readers are looking for before diving into your own game. The editor and basic scripting is pretty simple to get the hang of, but structuring a CYOA can get a little overwhelming sometimes if you're new at it. Usually it's best to start with a small game, make sure it's polished and proofread, and remember there's no reason to rush.
I'm not a big fan of the item system, I find it kind of clunky and unnecessary, but
this article should cover your questions.