i want to start watching doctor who, but i know there is a lot of episode, do i have to start from the very beggining? what is the best episode to start from?

I would definitely start with 'Rose' season one of the new series, they'll catch tu up on what tu need to know. And if tu like it well enough tu can go from there! Hope it helps!

The best one to start off with is "Rose", like the people above me said(even though I started with "The Impossible Astronaut").
If tu really want to go back and start at the very beginning, "The Unearthly Child" is the first episode. I think it's still on YouTube, and if not, it's on DVD somewhere in te vast expanse of el espacio and time.
But for the modern Doctors, start with "Rose". :)

I would strongly advise tu to start watching from the beginning if tu want to know the whole story. Start from the new Doctor Who series. The best episode to watch first is "Rose", the start of the 9th Doctor

I know theres lots of episodes, but you'll be fine if tu start with the modern ones:) So I'd start at Series 1 (2005) and continue there, that's what I did. tu won't be lost o anything.

If tu were to dive strait into doctor who either series 6 o the new on that's coming out fall 2012, than tu will most likely be very confused and put off the series. so tu should start with the the new doctor who ie. from 2005 with Christopher Eccleston "Rose". tu wont be lost and you'll get a lot más of the humor.

I would start watching from the beginning of the new Doctor Who era like everyone else says. Then if tu like those episodes and want to watch other episodes from the classics tu could watch a few on Netflix o on Youtube.

Start from the beggining of the new series. If tu don't it won't make much sense.

I started watching doctor who from the beginning of the ninth doctor and i have been watching it ever since.