CYP, nice summary.
Going to the Bible itself is oh-so-important. My Dad accused me of adding words to a scripture when we were discussing a point of JW doctrine. He was basing his accusation on what the literature had told him the scripture said. I found a Bible and - Well, lookey here! - it said exactly what I'd told him it did. (I admit, I dumped the 'good girl' routine for the first time in my life and really enjoyed that little dig )
M.J. also has a good point, maybe something for you to consider later: a discussion about where in the Bible it says we have to obey the rules and regulations of a particular organization to gain God's approval and salvation? Again, it's a matter of finding actual scriptures in context. When you read scriptures like Galatians 3 - talking about obeying man-made "law" as well as Mosaic "Law" - it becomes clear that the actual scriptures and their context are damaging to much JW dogma.