First year doing taxes for FBA
By personal assuming you are single member llc.
When you do your personal taxes, you’re going to want to add a schedule C for your business this breaks down your income and expenses more completely and gives you a better deduction 
It would depend how you have your LLC set up with the irs if you have it recognized as an s Corp or is it just an LLC. If s-Corp you need to file business and then a personal return with data from your business filing used to complete