That's the great thing about TGMike...his information is constantly updated...no 'old' information. There is so much information, photo tours, tips, touring plans, etc., I would join as far in advance of your trip as possible!!
Just please understand it is NOT a computer created touring plan. TGM is basically an online guidebook. He teaches you a set of logic with which to plan your trip, including sample touring plans. I also suggest you use the Search feature of the DIS and read through a few other TGM threads. Best wishes!