The first step is to develop a system for tracking your inventory. You can use a spreadsheet, database, or software program to help you keep track of what you have in stock and when it needs to be replaced. Next, make sure you accurately count everything you have on hand. This includes the physical items themselves and the quantity and description of each item. If you have multiple items that are essentially the same (such as different sizes of the same garment), list them as one item. Finally, review your inventory regularly and make changes based on what's selling and what's not. Finally, update your tracking system as you always have an accurate picture.