Kaplan Notes is enough and you don't need to see the videos. Have a look here http://www.usmle-forums.com/usmle-s...s/3533-do-we-need-watch-kaplan-ck-videos.html
You don't need First Aid for the CK have a look here
http://www.usmle-forums.com/usmle-step-2-ck-recommended-threads/395-first-aid-step-2-ck.html
In CK, be prepared for long long clinical vignettes that ask you what is the best next step.
Another thing, your Step 1 prep will really really help you with the CK prep.
Good luck