One other reason why I always hesitated to start with this series was the many spinoffs. I usually am a completist. How much interconnected are these series with Doctor Who?
Just got a chance to watch An Adventure in Space and Time. This is a docudrama of the creation of Doctor Who and the first Doctor William Hartnell. This really put a bunch of bits together for me as I had just watched the first two series and had read about all i could find on it. If you get a chance and want to know some beginning bits this is a great watch. Well off to the Tenth Doctor, portrayed by David Tennant and The Christmas Invasion