I am surprised your dad would encourage you to study the Bible without WT literature.
However, rejoice and take him up on his suggestion.
Study just the Bible, not the WT materials as your dad suggests.
In fact, invite him to study it with you.
I'd suggest the books of Romans and Galatians as a good starting point.
A number of Bethelites did that in the 1980s and left the WTS as a result!
I'd recommend using a recognized translation such as NIV, NASB, NLT, or NKJB, not the NWT.
If your dad insists on using the NWT himself, challenge him to check out everything the NWT says by the interlinear side of the Kingdom Interlinear.
They don't match in key areas.
If you'd like to chat with me about what you're reading in the Bible, I'll be glad to do it via PM.
I promise I won't try to get you to join or contribute to any organization and you're free to disagree with my conclusions.