There are several ways. You can start with the Classic series, of course, but finding it is difficult, to say the least. I still haven't been able to watch all of it myself.
You can start with the Ninth Doctor, which is the beginning of the show's reboot in 2005 — the first episode would be Rose. It's not the best episode, though.
Or you could try and watch some of the (IMHO) best episodes, such as Blink, The Shakespeare Code, The Unicorn And The Wasp, Vincent and the Doctor, The Lodger, or the The Empty Child/The Doctor Dances two-parter. Unless, of course, you mind watching a show in the wrong order, but most of these are stand-alones.
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You can start with the Ninth Doctor, which is the beginning of the show's reboot in 2005 — the first episode would be Rose. It's not the best episode, though.
Or you could try and watch some of the (IMHO) best episodes, such as Blink, The Shakespeare Code, The Unicorn And The Wasp, Vincent and the Doctor, The Lodger, or the The Empty Child/The Doctor Dances two-parter. Unless, of course, you mind watching a show in the wrong order, but most of these are stand-alones.