The supplies you had lying around would be considered part of your cost of goods sold for the year. You should come up with a value of all of these items that you had on hand at the start of your business, based on the information you have available. Add that amount to the amount for your purchases in 2018. Then enter the value of your inventory at the end of the year. The difference will be the cost of goods sold for the items that you made and sold in 2018.
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