Reddit reviews The Life and Times Of Scrooge McDuck: Volume 1 (Walt Disney's the Life and Times of Scrooge Mcduck)

The Life and Times of Scrooge McDuck by Don Rosa

This is just the first chapter, you can find the whole book in the Amazon link below.

It tells the story of Scrooge from his early life leading up to his older days which he is more known by.

This is easily my favourite story by Don Rosa. And it's a whole book! I always read it when I'm home on holidays.

EDIT:
As /u/ITHICmeaningstone pointed out; Supporting Don Rosa might be better then getting free copies online. So here it is on Amazon.

Paperback version cheaper alternative then the hard cover.

SECOND EDIT:

I retract my previous statement as it appears you can almost only buy it used from Amazon. Thus I sadly believe they are out of production. Someone may correct me if I'm wrong. There are some PDF's floating around the Internet though.

Read The Life and Time of Scrooge McDuck by Don Rosa. It is a collection of issues 0-12 of the series (issues 285-297 of the comic) The original paperback is $$$ since its out of print, but the hardcover is more affordable if you get it used. Going to a comic shop is the best bet. I expect they will have it on their shelf for cover price. Heck, you can probably buy the original issues for cover price.

In the original Carl Barks stories Scrooge would often make outrageous claims like the fact that he was a cattleman in Australia, a 49er in California or encouraged Teddy Roosevelt to take up politics. When Don Rosa took up the series and it turns out there is no bigger Carl Barks fan than him. He did a series of comics elaborating on all those fun tidbits and put together a quintessential history of Uncle Scrooge that is beyond enjoyable. It's a great read and gives you fabulous insight into McDuck's character.

Original Paperback

Volume 1

Volume 2

Holy crap, I just looked at the price and you aren't kidding.

The one I linked is the 1st edition, you don't want that one (well, you do, but JEEZ), which I had, but had to sell a couple years ago. Then they reprinted it at Volume 1 and Volume 2, which are still expensive, but not multiple hundreds of dollars. If you want a little extra, like the gravy in between the stewy bits, you might also want the Companion, which is really cool.

EDIT Just looked again, and you can get a new 1st edition for about half of what you can get Volumes 1 & 2. Honestly, I'd just see if your library has it before you drop a c-note.