Yes, those self-employment expenses should be subtracted from your Gross self-employment income to arrive at your Net self-employment income. Your self-employment income is then added to your other income (W2, 1099-R, et.,, depending on your situation). Your standard deduction is eventually subtracted from your Adjusted Gross Income.
Keep in mind that you will also owe Self-employment taxes (SE Tax) on your umpire income.
Without looking at the totality of your income, deductions and credits, your "owed" amount can't be determined.
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