Question
What products have you ordered, how much and where will depend a bit on the product?
Serious answer
If you have ordered A314, I would suggest start applying just behind/below your ears, if you want to increase the self effects apply to your jaw line.
If you have an socials, like Instant Shine, honesty, openness, then spray onto your neck first, or the wrist to increase effects on others. If I’m spraying multiply sprays of socials, I like to spray most to the neck (separating different products by side of the neck) and pply the last spray to my wrists,
If you have ordered more sexual products (like TUTH) then the top of the chest is an option to slow down the diffusion / reduce the intensity a bit.
But where ever you start, do experiment with different options.
As well as the link above from Alpha1, this post How to Find Your Sweet Spot? (An Introduction to Mones: Names, Size, Strength, Use, Effects & Duration - #9 by SteveO) is essential reading aswell.
Philosophical waffling
Getting the best out of AD products;
When you buy a TV, the instructions tell you to connect a couple of cables, switch it on, press a couple of buttons and Bingo! it works.
Buying AD products is more like buying Microsoft Windows 95 (damn, you’re 19, you probably never bought windows 95) it was a great product, revolutionary, but you couldn’t get the best of it straight out of the box, you had to tweak settings, mess about, combine it with other products and drivers, after a few months/years of experimentation you were getting fantastic results. Eventually after all the messing about and customer feedback they combined this knowledge into a new product, Windows 98 and the whole process started again.