Getting a domain name involves registering the name you want, for example a name like "example.com", with an organisation called ICANN through a domain name registrar, like GoDaddy, Moniker, Network Solutions, or a host of others.
When you are ready to go live, you will need to change your DNS information from the domain registrar account where you manage your domains.
If you are not going to host your emails with us and wish to continue hosting your emails with a different provider (for example GoDaddy, Google, Zoho, etc.) changing the DNS settings will break your emails. For this reason, if you are not going to host your emails with PageOneSites please change your A Record to 126.96.36.199.