Cost of purchases and mileage

I have two questions. I started selling on ebay Jan , 2019 and did not have a carry forward inventory. So I put zero. The question cost of purchases are they asking for my sold items or for all the items for 2019 even if not sold yet? Last question I kept my receipts for purchases and mileage but I do not have my starting mileage for 2019 I am not sure what to do there. Thank you