The thing is, I don’t know how to package an item like a video game disk or a system like a Nintendo DS or a Sony PSP.

I also don’t know much about the USPS and how to mail my items

For example, let’s say I had a person buy my DS game on eBay and I had to mail it to them to complete the sale (of course).

What steps would I have to take in order to take it to the post office and mail it in the right package and arrive at my customers address and at a cheap or inexpensive price? What kind of delivery do I purchase and what kind of package do I buy as well as any labels I might have to include on the package

I have an HP photosmart plus, so I can pretty much print.

Please respond in exact detail since I really need to know this

Thanks for helping out!