I recently stumbled upon this wonderful game and have tried creating my first items today. Even though the item was marked as common I haven't managed to get it in game yet (tried over 50 times in shop). Is there anything I missed? I just created the item with the Editor and saved it into Resources/Items.
No idea on this one, unless you were just looking in the wrong area of the Shop. Maybe try removing a bunch of items (put them in a different folder) and make a few more different items to see if they show up then?
Also I had some girl mods installed but decided they weren't for me so I tried to delete the relevant picture folders and .xgirl files but the names still appear as random girls in game. Is there a way to get rid of that?
Once a game has been started, and the girls loaded, you're pretty much stuck with them. You
can go into the save file (open it with a word editor; I use Notepad++) and manually delete the girls' entries, which will get rid of them. Or you can start a new game, which may or may not be easier/simpler.