Investors & landlords

i didn't use the Turbo Tax last year, and my Sch C,cost of goods sold is $0 in 2015. i try to use Turbo Tax for 2016, so what's the number is beginning of 2016 in COST OF GOODS SOLD? it should be Net profit or gross income of 2015? where can i find it on Profit or loss form 2015?
Thank you so much!