Grab the Instrument PTS and create a lesson plan for each task, aslong as there aren't any duplicates from what you already have (ie engine starting, preflight, etc.) Jepp certainly is a good resource but use is as a secondary reference. Try to utilize the PHAK, FAA Instrment Procedures Book, and Instrument Flying Handbook as your primary resources.

I wouldn't deviate from the format of the lesson plans you used for your CFI-A unless a fed grumbled about it. You'll find the CFII probably to be a relatively easy checkride in comparison to the CFI initial.