need to file my net operating loss on a small retail biz, hard to determine exact expenses like repair costs, starting inventory etc...

can i estimate repairs (near accurate, say around 4k) or do i need an exact number?

does starting inventory include the bill of sale cost for the turn key biz, or just what i purchased at opening for resale?

do i subtract cost of CC merchant machine, beverages for resale, merchant account fees, etc?

my NOL for 2014 is somewhere between 25 and 50k

thank you very much in advance !