The C-Corp would have issued you a W-2 (as you stated) and probably a K-1 also. (Can't recall on the K-1). On your personal taxes you'll claim any qualified expenses under the Deductions & Credits tab when you get to that point in the program, in the Job Related Expenses section.
Just make sure you don't double-dip. If you claimed vehicle expenses on the 1120, don't claim them again on your personal tax return. Else it comes back to bite you in about 24-36 months after you file.