How do I get my offline wallet?

Hi, I am looking to purchase these coins. I watched the video but I do not fully understand how the offline wallet work.

How do I use the money from the offline wallet? How do I get out the money from the private wallet that i create offline? how does all this work?

Is there anyway to put the wallet on a USB? If yes, how do I exchange those coins and how do I store them safely?

Will they come to ledger nano s?