Reddit reviews Dynasty: The Rise and Fall of the House of Caesar

Augustus by Anthony Everrit is a great place to start for the life of Augustus.

Tom Holland's Dynasty is amazing as well and covers all of the Julio Claudian dynasty.

For original source material, Plutarch's Lives and The Lives of the Twelve Caesars by Suetonius.

It's already been mentioned here, but I'll mention it again: The History of Rome podcast by Mike Duncan is an easy way to digest this stuff. The production quality in the beginning is very poor, but that gets so much better as it goes on.

He published a book last year called The Storm Before The Storm, which is about how the Republic got to the point where men like Julius Caesar were able to come onto the stage and do what they did. There are some really disturbing parallels to our own times. While it's always a bit silly to compare America to Rome, the similarities are fairly stark. The paper back comes out later this month.

Duncan is also currently producing a podcast called Revolutions, in which he does narrative histories of the English, American, French, Haitian, South American, and Mexican revolutions, as well as the French Revolution of 1830, the pan-European revolutions of 1848, and the Paris Commune. I know this is off topic, but Duncan really is amazing and I never miss a chance to plug his work.

Edit: here are the two episodes of The History of Rome that deal with Augustus's style of rule. Caesar Augustus and Reigning Supreme.