Now there’s three very good answers to this question:
A) Start with Series 1 of the 2005 Reboot
This is where it all began…at least for us “New Who” fans, this is where it all began. Russell T. Davies took the classic series and reinvented it for the modern age, all the while maintaining the continuity and bringing back some classic baddies (The Daleks, The Cybermen). As Rose Tyler is introduced to the world of The Doctor, we get to share the discovery of just what exactly “the madman with a box” is all about. However, it’s a very rough product as the budget wasn’t as awesome as it is today, and the writing still needed just a little work.