To use Shopify's inbuilt capabilities for showing multiple language versions, you need to have a theme which supports language versions. All Shopify's standard themes have support for them as well as many existing themes as well. Please contact your theme developer to ask for support.
If you need to have different campaigns, products, or payment methods for different market areas, the easiest way is to have two separate Shopify stores.
Transfluent's Shopify app supports both ways to implement a multilingual store. Please ask from more from sales.