How to ship things I sold on eBay?

i've just turned 18 so i'm finally allowed to sell things on ebay. so, i'm looking into selling some things, but i've never sold anything and never really had a reason to go to the post office to send packages. so, i was just wondering whats the process...

I just sold my first item on eBay and I printed out a shipping label from eBay. A medium flat rated box. So, do I go to USPS and get one of those box for free and give it back to them to ship it? Also, where do I buy bubble wraps? I don't need a large...

Sold item on ebay.. small amount less than $20. On all my auctions I require payment within 2 days, I'm selling things in groups and I like to get them all out on the same day, it makes things easier and transactions are smoother.. so buyer did not pay...

I just sold something on eBay and its big its a guitar hero super bundle that weights 18 pounds. How can i ship it? On ebay i see that i can print a shipping label, but what it that? another thing if i buy a box to ship it in office max of office depot...

Ok so I sold a game today on Paypal, and I told the guy I was going to ship it on monday because I dint have time today to ship it and the place to mail it wont open tomorrow, until Monday. So I checked on my paypal account and it says On Hold-Ship now...

I sold an sold an item on Ebay and then i bought a shipping label on paypal but my printer is not working so i void the label, but payal marked my item as shipped on ebay. Can i cancel it the transaction on ebay and and refund the money or should i refund...

I want to start selling hats(snapacks,fitted) on ebay and i was wondering what would be the cheapest way to ship stuff i live in colorado and how do i ship stuff to other states in the united states like los angeles and stuff around how much would it...