Yes, it is ok for you box 15 to be blank since Texas does not have a State Income Tax.
Box 12 with a code C is the taxable cost of group-term insurance over $50,000. If you had group term life insurance through your workplace, the premiums for any value over $50,000 become taxable income to you and are included in box 12.
Box 12 with a code D are Contributions to your 401(k) plan. Contributions to a 401(k) plan reduce your taxable income in box 1.
Box 12 with code W are Company contributions to an employee's health savings account (HSA).The IRS, by default, assumes that these contributions are taxable until you complete the Form 8889. Please make sure, that you answer the follow-up questions about HSA. If they do not come up go to to Federal Taxes->Deductions & Credits->Medical->HSA, MSA Contributions.
Box 12 with code DD are Cost of employer-sponsored health coverage. These are the total cost of what you and your employer paid for your employer-sponsored health coverage plan. Code DD amounts are for informational purposes only—they don't affect the numbers in your tax return.
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