(as they pertain to the Presence department)
Building a shop requires knowledge of not just how items work, but also catalogs, shop data, etc. If you desire to build a shop, you may be trained on this, but note that the two (creating items and creating shops) do not necessarily have to go together. Speak with your department manager to discuss your project to find out what option is best.
For more information and help on items, you may consult the Staff Orientation Training guide.
Additionally, help guides for creating items as well as shops can be found under the Rooms & Areas section of this website. If you would like training on creating items, rooms, etc., please speak to your department manager.