One of the odd things about the CPDLC approval process is the FAA leaves the checklist up to you but doesn't know enough about data link to really QC yours. At least they missed the collection of errors in ours. Errors? We pretty much submitted the suggested checklist from Gulfstream and only discovered the errors after our first trip with CPDLC.
So develop your own checklist and if you like, here is ours: Data Link Checklist.
Portions of this page can be found in the book International Flight Operations, Part IV, Chapter 6.