Make Excel Spreadsheets for My Business

I have an inventory of games that I am selling. I am looking for help organizing my records from a business perspective in a google sheets spreadsheet. I have certain things inputted in a bad spreadsheet now, such as:

*date purchased
*game name
*console
*cost
*value
*price realized
*shipping cost
*ecommerce site fees (need easy way to input fees with formula)
*net profit