I think many here have expressed sufficiently on what you should or should not do.
I can fully agreed on the following and I hope you can exploit it to a benefit: Help your mum (I believe she is still an active JW).
1) Do not get baptized
2) Do not get involved with the Elders anymore. “Shun” them like how they would you eventually. So if they are at the door, don’t answer. If they call, don’t answer. If they write, don’t reply. If you are easily “motivated” with words by them, don’t even read their letters.
At the meantime, please do not think of becoming an atheist. This is precisely what WT paints everyone leaving to be – someone who had forsaken God. Yes, this is just another device of Satan. So please do not fall for it. Your eternal future means a lot to God.
Try to read the Bible daily, even if it’s just for 30 minutes. Invite your mum to read with you without WT articles. Pray with her. Let her know you love her still. You just hate the diabolical WT. Invite her to know God better along side you.
I think you have enough “WT Facts”. Why not try gaining Bible facts now? Go to Christian web sites that can increase your faith toward God. Sites I personally benefited from are www.GotQuestions.org and http://bible.org. Try visiting them and strengthen your spirituality. Invite your mum to join you. Otherwise, print out the materials you think she can benefit from.
Leaving WT is not an easy task because of the mental symptom called “cognitive dissonance”. But with careful planning and efforts to lessen the shunning effects, both you and your mum can leave eventually. Don’t forget the power of prayers. It’s something many rely upon heavily during their final days in WT and afterward.
May the peace of God be with you always. Amen.