You do not need to enter the whole business on day one. Set up one small area correctly and learn how locations and movements fit together.
Start with real locations
Give the first warehouse the name you use at work. Add a shelf and bin only where you need them. Short names such as A1 should match the labels in the room, so the next stock entry or transfer goes to the right place.
Add a few items
Choose three to five items you handle often. Give each a unique SKU, the right unit and a barcode if it has one. Enter a minimum stock level only when you know a useful threshold. If you have a larger catalogue, import item details from CSV.
Record opening quantities
Creating an item does not create stock. Count what is physically there and finish a count, or record incoming goods with Stock In. After the first movement, check both the item total and the shelf quantity. Without an account, data stays on this device; create a workspace when you need to share it.