Hard to say, since there are so many points to start from. I guess it depends on whether or not you want to see the older episodes or not.
If you're still confused, this guy might set ya straight: http://blip.tv/sf-debris-opinionated-reviews/doctor-who-101-5123833
If you're still confused, this guy might set ya straight: http://blip.tv/sf-debris-opinionated-reviews/doctor-who-101-5123833