I would say throat/upper chest or sides of neck, then spread out to the wrists/forearms depending on clothing etc.
Personally, with anything none, I would always start from the centre line and work out. Socials go the other way but don’t spray none on your head unless you are bald/shaved - It binds very effectively to hair and can be very difficult to remove when it starts to stink.
All the info you need for effective phero use is in this thread, applies to NPA just as much as anything AD:
An Introduction to Mones; Names, Size, Strength, Use, Effects & Length of
And as this is your second post, have a read of this thread:
https://pheromonetalk.com/t/how-do-i-qualify-for-a-25-gift-certificate/19934
Then go and start your own thread in the Intro Forum. With that info, we can probably offer better advice and you will earn a useful GC. NPA and IS or IH is a good combo. 