If the expenses have to do with your business, they are entered in the business section. They have nothing to do with the standard deduction. They are subtracted from your business income.
If you don't wish to itemize deductions on your return, you don't have to enter things like mortgage interest and property taxes. TurboTax will take the standard deduction for you. You might want to enter these amounts -- they may help on your state return.
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