Inventory spreadsheet

I'm looking for assistance creating a basic inventory spreadsheet using Apple Numbers or Open Office to help me manage my physical product business. I don't have a system in place and am seeking a new inventory system. In particular, I need to be able to update it on my own weekly. This spreadsheet will need to cover specific areas of inventory control, such as item number, description, quantity, location, cost, total value per item, selling price, and total inventory value. It will need to provide easy-to-interpret metrics and reports for better decision-making. The ideal freelancer should have proven success working on inventory systems and should possess a strong working knowledge of Apple Numbers, or Google Sheets, If you feel you have what it takes to create a basic inventory system, I'd love to hear from you!