I know of this series and it popularity, but how do all of you in the states watch it seeing that it is an English show? Also, what is a good point to dive into the series? I obviously can’t go back to season 1 episode 1 since it’s been since 1963.
BBC America, if you have it on your cable line-up, shows the current episodes. If you do not have access to it, I would recommend trying to find the series/season sets at your local library.
When to step in is a sticky question. At present, they are in the midst of series 6; for the current run (i.e. Matt Smith), I would recommend trying to find the Series 5 episodes, once again on cable, OnDemand, or at the local library or rental, to see the current Doctor from the beginning. If you are more interested in seeing any of the previous Doctors, I would suggest the same, to try to catch their reigns from the beginning.
As has been previously noted, your favorite will probably be your first; I am very much a fan of Matt Smith, but my Doctor will always be Tom Baker (i.e. Doctor #4).