The first step to running inventory is to choose what you will inventory. You may wish to inventory the entire library collection or just plan on running inventory on specific collections.
If you plan to inventory the entire library collection Co-op Support recommends breaking it into sections, based on shelving location and/or call number range.
There are several report templates you can use to aid you in preparing for your inventory.
Sitka_templates → Collection → Item and Title Count → Title & Item Count by Shelving Location & Circulation Modifier
Sitka_templates → Collection → Item List by Item Attributes → Shelving Location : Items with Selected Shelving Location
Sitka_templates → Collection → Item List by Item Attributes → Call Number : Items with Call Numbers within a Range