Konata Izumi wrote:
Or you can start from the current 11th Doctor era where it's 34.
You could but "Rose" the first episode of the 9th Doctor was designed for new viewers.
As was every series opener bar Series 6.
But the point is to get Torchwood
background - at which case you might as well stop
at the end of the 10th Doctor's era.
There's so little it's not worth watching a million episodes just for that. Wikipedia's for that.
Just watch for a good show.