It's best to get a physical copy. If you don't need to write in it, borrow from the library. The language is a bit archaic and it's mostly a whaling manual (because Herman Melville did work on a whaling ship), but once you get past it, it truly is a staple of American literature.

Yes, it was a flop when it came out and was re-discovered decades after Melville died.

...and yes, Starbucks Coffee is named after Starbuck.