In administration panel go to Configuration => Products configuration
Prices of all the products in a shop are presented as net.
Products with price 0 will not be displayed in a shop.
Check out products attributes documentation.
Hides the prices of all products in a store. You can hide a price of the selected product in its edit.
Check out products documentation.
Check out users documentation.
Check out stockroom documentation.
Check out products options documentation.
Check out shopping cart documentation.