Well, this is going to take a while.
I do think the key to Job is getting the main theme right, and recognizing that it is written differently than other books. It's actually written like a play rather than a historical narrative, letter, or gospel literature (like other books/letters).
If you understand that, you won't get lost in the debates in chapters 3-30.
Spoilers: 1. Job's contention against God, is based on outward appearance of righteousness. He believes his spiritual condition is OK, and he is all too ready to make that claim.
2. Job's friends are ready to find a sin after any adversity, and put themselves in a role that is exclusively God's.
3. Elihu is the only one that isn't rebuked by God; he is the godly young man wanting to set Job and his friends correct. He typifies a faithful witness on earth for spiritual matters.