Forum:KB:CANON Old Republic and LEGENDS Old Republic

I've just wanted to get this out of my head because it's really confusing me...

Basically, i thought that the whole "Galactic War" and the "Jedi Civil War" all took place within the actual Star Wars Canon, but i did my Wookieepedia browsing and noticed that both of the wars were actually Legends. So now i'm really god damn confused on what happened before "The Phantom Menace" in the official Star Wars Canon. The only thing i do know is that there was only the "Galactic Republic" and the "Jedi Order", and that one day some Jedi's discovered the "Dark side" of the force, and it was the Jedi vs Sith until the Sith was no more and there only remained one "Darth Bane", who made a so called rule that there was only to be 2 Siths at a time. And there this was some "Hundred year darkness" and then "Darth Maul" appeared.

All i'd like is a little more detail on what happened between this Outbreak of the Darkside and just basically more on what happened before "The Phantom Menace" and remember it needs to be official Star Wars Canon, not all the Legends stuff. If there is any books that tells me about this (canon) then i'd more than like you guys to recommend me some!

May the force be with you RogueJedi501