You have to keep records separating expenses incurred in producing your Form 1099 income and unreimbursed employment expenses related to your W2 income.
Unreimbursed employment expenses related to your W2 income are reported on Form 2106, and in a separate section in TurboTax. Under the current tax law, unreimbursed employment expenses are not deductible for Federal taxes for most people, but I would still encourage you to enter them in TurboTax as they may help you with state income taxes.
You can deduct qualifying business expenses in respect of your 1099 income on Schedule C. You report the expenses in the Self-employment part in TurboTax, and the software will create the Schedule C in the background.
For the home office, you can split the expense between the W2 work and the Schedule C business:
https://ttlc.intuit.com/community/business-expenses/help/can-i-claim-the-home-office-deduction-for-t...
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