eBay

Hi, I am interested in selling Sports Cards but don't know which EBay shipping option to choose to make it affordable. I guess I don't understand USPS pricing, even after looking at their website. If anyone can break this down and simplify it, I'd be...

I offer free shipping with my goods. When does ebay charge me for the shipping? Do they take it out of the sale price? Where can I verify this transaction occurred? Thank you.