Any examination taken for the purpose of adding a new certificate or rating also acts as a binannual flight review; for instrument instructor certs it includes instrument currency as well. I should give ref's but hey it's late Friday evening and there is a cool show on Cessna history running on the tube.
I am working on my double II as well, I am just reviewing old materials. Get the PTS for CFII (FAA-S-8081-9C), get out your old Jeppeson textbook or whatever you used for your instrument rating as a resource, use the same same videos as well (I have Sportys Instrument Rating Course), and refer to FAA Instrument Flying Handbook FAA-H-8083-15A.
At some point you are going to have to get some training in the airplane. First get sharp on laws, tricks and rules. PC sims are useful in connection with instrument flying skills, get your plates out and start flying them on the PC. I use X-Plane but MS Flight Sim X should be ok.