Get either one of the kit lenses, I would recommend the 18-135 for its reach. There is a reason why camera makers offer a bundle with a kit lens for beginners. Get other lenses once you know why you need them.
I would also advise you to get the 600D with the kit lens, but instead of the 18-135mm, I would go for the 18-55mm + 55-250mm lens.
I believe that the 18-55mm lens' IQ is good enough for lots of use and with the 55-250mm (sometime you get purchase with purchase price), the entire bundle might cost the same or slightly cheaper or more expensive when compared to the 18-135mm kit/ With that combination, you get both the width needed (18mm) and the length needed (250mm).
I started off with that combination for quite sometime before upgrading the lens to a 70-200mm f4L.