I'm sure others will chime in with a list of steps you will want to take, but I think the first order of business is to not touch the idle or mixture screws, and check for vacuum leaks with your smoke tester. The vacuum lines, intake runner "sleeves", and the airbox and pop off valve are common sources of vacuum leaks.
When you remove the oil filler cap with the engine running, the engine is supposed to change idle in response to the vacuum leak the open tank has introduced. If this happens, I have been told this indicates you are generally in good shape. Others with more experience will correct me if I am wrong!
Also, this video is a great intro to CIS
https://youtu.be/slCzVrrST2Q