Hi,
In order for a wiki to be useful, it needs to have a strong community behind it. OSM has millions of users. HikaShop 10s of thousands. The scale is not the same. Almost no one would edit it and it would take us a lot of time to handle spam. We welcome anyone to share tutorials they create. We'll be more than happy to integrate them on our website or link to them, as we already did for the ones that were already shared with the "resources" area.
As the documentation explains, you can export the CSV of some products you already created via the interface. It's simple, there is an export button on the products listing for that. That will tell you all the possible columns and what information should go in which column.
Regarding the currencies, you probably missed the menu System>Currencies which lists all the currencies. On top of that, it is the standard ISO code for currencies, and on top of that, if you do an export of prices in different currencies, you will see the ISO code of all these currencies.