How to correctly enter eBay related deductions?

Hello all.

I believe that I am almost done doing my taxes for the first time as an eBay seller. However, I am unsure about a few details.  Could one of you please try to assist me with these?  Thanks in advance.  Here goes:

 

1--Where is the proper place to put the Postage charged to buyers that is included in box 1a of my 1099-K? Under "Other Miscellaneous Expenses?"

 

2--Where is the proper place to put/deduct the fees that eBay charges on each sale? Should this go under Under  "(sales)? commissions"" or Other Miscellaneous Expenses?"

 

3--Where is the proper place to put the Value of items sold?  Should this be under a) supplies or b) inventory / cost of goods sold?

 

Thanks again all!