If the used items were things you bought for personal use and then sold them for less than what you paid for them, you don't need to report anything on your tax return, since the loss would not be deductible and you are not reporting business sales or hobby income.
Otherwise, you would report the income as hobby income or business income (if you had a profit motive.) You would report the income in the self-employed income section if you had a profit motive. If you did that you could deduct the associated costs. Otherwise you would report the income as hobby income in the Wages and Income section, then Less Common Income, then Miscellaneous Income, then Hobby Income.
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