He didn’t excerpt so he’s not blog pimping :^)
One problem is that the government keeps track of what you sell, like any other business. So you have to keep complex and complete records.
Plus, make sure you charge enough for shipping. Some things are going to have to be packed.
Shipping overseas costs more.
Some countries have great post offices; India, for example.
Others, like Italy and Ireland, are not so good. (Some people actually refuse to sell there, as a result.)
Be sure your product description is complete and lists any flaws, so that the buyer doesn’t want a refund.