There is no real beginning, just a starting point in time. To follow the story the sequence they were written is to follow the production of Star Wars, not the story itself. Nothing wrong with that, just that you should recognize that fact that you are watching the chronology of George Lucas. I prefer to watch Star Wars.
Episodes 1-6 have many gaps. Real Star Wars fans know this weakness in his writing and this is why there are additional stories to fill in those gaps. As long as the writing is engaging and entertaining for me, I'll watch it. After all it IS still just fiction so that is what matters, entertaining and engaging. If you found clone wars not part of the canon then maybe it is what it is for you Kind of like the gnostic gospels are to religious folk who recognize the Bible as the word of God. Scientists recognize those writings as part of history told by another writer.
From what I understand the Star Wars epic story was designed around Flash Gordon to be in 12 episodes but was later organized into 9 or a trilogy made up of 3 movies per episode. The best explanation I have heard as to why he started the the middle Trilogy, episode 4 is because he recognized that the beginning offered audience little excitement as it was mostly about the development of the society explanation and the Skywalker family, the Jedi etc. So he started with the middle trilogy hoping the increased action would spark the theater audience. History tells us he made a correct decision. By the time he got to episode 6 he saw some flaws in his story and decided to end the epic with 6 by combining the remaining 3 episodes 7-9 into 6. I won't state specifics here as it would constitute a spoiler. Clone Wars was a cheap animation production that filled in the story alluded to in Episode 2 bridging the gap to Episode 3. Lucas could have begun with Clone Wars in 3, moved through it quickly and then into his Episode 3. Disappointing to me he didn't do that. I would like to see more of the story, those missing years made into more low budget shorts and for Lucas to continue the story beyond where he ended in 6.