You cannot take a Section 179 Expense deduction. When you use property for both business and nonbusiness purposes, you can elect the section 179 deduction only if you use the property more than 50% for business in the year you place it in service.
For how to determine the method and amount to deduct for the use of your personal vehicle for business, see IRS Topic 510 - Business Use of Car. This short publications has answers to the rest of your questions. If you want more details, see Publication 463, Travel, Entertainment, Gift, and Car Expenses
Business use is determined by the miles you drive. If you drive 10,000 miles for business and 20,000 miles for personal use, your business use is 33.33%. If you use the Actual Expense method, then under that scenario you could deduct 33.33% of all eligible automobile expenses.
By far, the easiest method is the Standard Mileage method.
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