Create Item Definition
Creating
To create new items in a database, select the "New Item" option
If created successfully your editor will update to show the item in the Item Definitions tab
Setup New Item Definition
Define your item's settings, the most essential ones for this start are id, name and whether your item stacks
See more about item definition on Item Definition.
For this quick start we put a wood with 16 stack, this will be used for the next steps of this guide.