Further details on CDS will be published once it is on general release, accessible and proven to be stable enough to cope with the transition from CHIEF.
At the time of writing there is no definitive date for this but we will update regularly.

CDS – The CHIEF Replacement Service

Update from BIFA 14/02/2020

BIFA have published the following documents (Please note this is not a guidebook)

Guidance on the Customs Declaration Service

Additional Data Requirements for CDS

Additional Data Requirements Guidance (to be read in conjunction with above form)


Here are some other links which may assist :

What is CDS and why is it replacing CHIEF?

UK Trade Tariff Volume 3 (CDS Imports)