I'm glad to help track the inventory for your restaurant, accounting-manda.
Before we start, you need to know that setting up the first inventory item will automatically create the Inventory Asset (Other Current Asset) and Cost of Goods Sold accounts. Feel free to read through this page for more insights: Understand inventory assets and cost of goods sold tracking.
Also, QuickBooks uses the First In, First Out (FIFO) concept whenever sales of inventory items are entered. You can refer to this link for more details: How to calculate and record Cost of goods sold.
To start tracking your items, you need to turn on the inventory tracking feature. Let me show you how:
Check out this article for instructions and detailed steps: Set up and track your inventory in QuickBooks Online.
Stay in touch with me if you have follow-up questions about recording your inventory in QuickBooks. I'll be around to help you.