eBay Digital Content Help

I want to start selling the windows key & much more on eBay. I don`t know from where I`ve to start. Can anybody help me step by step. I want each and every information from start to end like how to secure the account, requirements or whatever.
Each & Every information should be appreciated.

Drignity said:

I want to start selling the windows key

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That will get you banned really quick.