1. Make sure the customer is able to unsubscribe from your newsletters
2. If someone unsubscribes have a routine where you delete the contact details from the e-mail marketing list
All other matters regarding marketing contacts will be postponed.
If you meet these requirements it is enough for now.
You can look at Triolab.dk for an example how to write the text. https://www.triolab.dk/footer-bottom-menu/cookies/ They also have a good example of legal rights https://www.triolab.dk/footer-bottom-menu/legal-rights/