I understand the challenges you've encountered while setting the date for your inventory, Bossymary. I'll provide some information to clarify things out.

In QuickBooks, the tracking date is established when you create the product, whether the product has been purchased before or not. 

When creating a new inventory item, it's crucial to take note of the tracking date. This allows you to set the date for any adjustments to the quantity on hand, ensuring it comes after the tracking date you've entered.

Furthermore, you may refer to this article if you want to use reports to get helpful insights on the things you buy and sell, and the status of your inventory: Use reports to see your sales and inventory status. 

If you need further assistance, you're always free to comment below. I'm always here to help you with your concerns.