Tax Help..... What Form

Hey there drivers! A few years ago I did a lease purchase (mistake of my life) and have put off doing taxes for that year until now.

The lovely IRS withheld my income tax this year as they say I owe them $12k. I just got my disk from ATBS the Trucking Accounting company so I can make that $12k into a negative amount.

I understand I can deduct my fuel, truck payments, and other related things that are all on my disk from ATBS. However, what form do I use? I did some Googling and found Schedule C? The small business proprietor form but see nowhere I can add my deductions.

Does anyone have experience with this that can help? Let me know what form(s) I need?

Thank you in advance.