IMO no study aids of any kind (including group study or essays/publications) should be used.
The god of the bible says he wants us to worship him, and says he gave us brains to understand and this book to read. Hence, we should be able to read it ourselves and it should be fairly obvious it's true. If the bible is what it says it is, anyone reading it should be blown away by it so much that they fall on their knees and weep.
There should be no mystery about its basic teachings/passages.
Yet religions/people persist in reinterpreting what it says, so much that most people don't read it and the rest immediately revise its meaning in their heads once they do. Instead we need to deal with the bible on its own terms, understand it for what it really says.
I believe reading the bible yourself, w/o influence from others, is the best possible thing to do to solve the mystery of what to believe. It will be very obvious once you read it without influence from others.