Here are three resouces I have made available on Jehovah’s Witnesses.
There are two PowerPoint presentations, one on the background of Adventism which led to the rise of JWs. The other is one on JWs, what they believe, and how to share the gospel with them.
There is also a paper I did which looks at how their denial of the Deity of Christ affects their view of what Jesus did on the Cross and salvation.
I pray that these are of some value.