From our own experience we recommend to buy domains on subreg.cz (that is not cooperation), because subreg offers a wide range of domains from .cz to .xyz in terms of prices is more expensive, but if you own more domains from more states, the advantage is that you will be able to manage domains from one account.After you buy a domain you need to point it to Microsoft azure, which the whole system Retailys runs. As the promotion of domains can take up to 48 hours, this is the third point in creating an e-shop.