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I am going to assume that you are a casual gambler rather than this is your business. I have added hobby versus business at the bottom. Please determine if you are in fact a casual gambler before proceeding.

Grab a calculator or make a spreadsheet. Next, go to the income section, scroll down to Other Common Income. Select income from 1099-K. 

Since you received a 1099-K for multiple things, you have to break it down for each category.

• If you had hobby income, select that button, enter the 1099-K information except the income. Instead, use your calculator determine all income related to hobby and enter that amount.
• Next, personal item sales, enter the 1099-K information again except for the income. Use the calculator and determine the personal item sales.
• Continue doing this through all of the options that apply to you. Gambling is not listed so the majority of your transactions will be lumped into other taxable income, the last option.

Topic No. 419 Gambling Income and Losses for the casual gambler notes:

You may deduct gambling losses only if you itemize your deductions on Schedule A (Form 1040) and kept a record of your winnings and losses. The amount of losses you deduct can't be more than the amount of gambling income you reported on your return. Claim your gambling losses up to the amount of winnings, as "Other Itemized Deductions."

Earning side income: Is it a hobby or a business? states:

What the difference between a hobby and a business? A business operates to make a profit. People engage in a hobby for sport or recreation, not to make a profit.

Here are nine things taxpayers must consider when determining if an activity is a hobby or a business:

• Whether the activity is carried out in a businesslike manner and the taxpayer maintains complete and accurate books and records.
• Whether the time and effort the taxpayer puts into the activity show they intend to make it profitable.
• Whether they depend on income from the activity for their livelihood.
• Whether any losses are due to circumstances beyond the taxpayer’s control or are normal for the startup phase of their type of business.
• Whether they change methods of operation to improve profitability.
• Whether the taxpayer and their advisors have the knowledge needed to carry out the activity as a successful business.
• Whether the taxpayer was successful in making a profit in similar activities in the past.
• Whether the activity makes a profit in some years and how much profit it makes.
• Whether the taxpayers can expect to make a future profit from the appreciation of the assets used in the activity.