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The FAQ linked above should answer your questions. Whether or not you withdraw from your account is irrelevant. You will receive a W-2G when your winning meets the IRS criteria for that specific gambling activity.
The IRS instruction for W-2G is here:
https://www.irs.gov/instructions/iw2g
You must report your winnings on page 1 of your Form 1040. You may deduct your gambling losses as an itemized miscellaneous deduction on Line 16 of Schedule A, up to the amount of your winnings. That means you lose the ability to take the standard deduction if your gambling losses are relatively large.
