Today is Internet Safety Day, you may find the following websites useful:
https://www.internetmatters.org/https://zeeko.ie/
https://www.verywellfamily.com/a-sample-cell-phone-contract-for-parents-and-tweens-3288540
https://www.tusla.ie/parenting-24-seven/6-12-years/child-safety-practices-reduce-injury/tips-for-your-child-on-the-internet/
https://www.commonsensemedia.org/blog/16-apps-and-websites-kids-are-heading-to-after-facebook