The buyer pays you for the shipping and then you either print a label online or go to the post office to buy a label. If you are going to ship using the post office in your country you will have to check their international shipping prices for a service with tracking. You want to make sure that you have delivery confirmation. When you list you will have to use a flat rate for worldwide shipping which makes it difficult as it is obviously less expensive to ship to some countries than to others.
To be perfectly honest, those type of items do tend to attract dishonest people so there is a risk selling something like that online.
