There are two options to point your website to Cloud DataWorks - you can use Cloud DataWorks's name servers with your domain, or you can just update the domain's A record to point to your hosting account's IP address.
Both the IP of your account, and your Cloud DataWorks name servers are available in your Client Area -> Services tab -> Product/Service, under the account you will be hosting the domain into.
If you opt to change your domain's name servers to Cloud DataWorks's, all of your DNS records will be managed in your Cloud DataWorks hosting account from there on. You can do it by navigating it to Client Area -> Services tab -> Product/Service -> Open Control Panel use the DNS Settings in Plesk to control them. This will also point your domain's email service to Cloud DataWorks.
If you choose to point your domain's A record instead, only your website will be pointed to your hosting account. Your domain's DNS records will still be managed with your previous host/DNS service provider.