In order to be ready for the process from January 1st 2021, please visit https://www.gov.uk/transport-goods-from-uk-by-road to get the information that will help you understand what you need to do.
Follow the step by step on how to transport goods commercially if you’re driving from the UK to any international destination.
Also visit https://www.gov.uk/transition to follow the transition protocol, as well as https://www.gov.uk/coronavirus to keep yourself updated on the current Coronavirus (COVID‑19) rules and regulations.