Shinjuku Station to Shinjuku Isetan

Which exit do we take from Shinjuku Station to get to Shinjuku Isetan? And how to walk?

https://goo.gl/O9iBBF
look at the above google map direction.

Which exit do we take from Shinjuku Station to get to Shinjuku Isetan?
From the map, look like you'll be taking the Central East Exit
（中央東口）. It's about 6mins walk/ 450m.

And how to walk?
Put your right foot front(always start your journey with right foot for good luck) and the left foot. Repeat the action. At the same time swing the opposite arm.

If you are coming from Shinjuku station of Tokyo metro Marunouchi line which is underground, just follow the sign of "B5" exit. It's about 6 mins walking distance from Shinjuku station.
If you are coming from JR Shinjuku station, go to Tokyo metro Shinjuku station(Not Shinjuku station of Toei subway line, "TOKYO METRO LINE") and then follow the sign to go "B5" exit.

It is not Shinjuku Station (M-08) but Shinjuku-sanchome Station (M-09, F-13) which is closest to Isetan Shinjuku Store among Tokyo Metro Stations.
(Shinjuku Station (M-08) does not have Exit B5.)
Also Shinjuku-sanchome Station (S-02) of Toei subway is close.

And how to walk?

From what station and by which line will you come to Shinjuku Station?
Shinjuku and Shinjuku-nishiguchi Stations (of five railroad operators) exist in a huge complex, which may well be a labyrinth for first-time visitors.
So, in order to avoid a risk of misleading you, you railroad line needs to be specified.

- JR-East: Shinjuku Station
https://www.jreast.co.jp/e/stations/e866.html
: In the map on this page, the north is roughly to the right.

If you come to Shinjuku Station by a JR line,
you can go down from (around) the north end of the platform to the underground concourse,
pass through East Gate,
go up to the 1st floor (= the ground floor),
get out via East Exit, turn to the right (=the south),
go for about 30 meters, take the crosswalk to the left
and follow this route shown by Google Maps for about 290 meters to Isetan Shinjuku Store.
https://www.google.co.jp/maps/dir/35.6912046,139.7015616/35.6912857,13...