You could also start an online blog. They can be anonymous and they are a great way to organize your thoughts, evidence from websites, files, etc. And then they are in an easy place to go back and look at them.
On a side note ... it helped me to also make a list of non-doctinal issues that are part of the Witnesses. More sociological issues (and some doctrinal issues overlap to sociological issues.) Shunning, education, lack of tolerance for outside research, intolerance of researching their own religion's past, hypocrisy, judgmentalism, degradation of women, condemning all others not part of their group ... those things bothered me more than any doctrine.