The link below contains a Google Doc with tabs for each Item Type in Centerbase is extremely helpful when planning and performing an import. The guide is constantly being updated, but there could be differences in field name depending on the version of your database.
To accommodate this, the guide also contains a column for the Field IDs. These will be unique and the same between all database, so when in doubt, use the Field ID as reference and not the Field Name.
The guide is here
A KB with all default Item IDs and Field IDs is located here
A KB with the Item types and their common names is located here: