Hiya - Welcome to Pherotalk. 
TBH, Amazon is not a brilliant place to buy pheros. There are many very oversold and often fake products on there.
If you want to search around, you will find the good phero sellers and products in discussion here - AD is near-unique among phero sellers in that they permit discussion of genuine competitors here and only prohibit on the shonky guys. Their comittment to research and ongoing testing is similarly way ahead of anyone else.
However, AD’s own products are about the best and most reliable, so using your GC to get started would be the way to go here.
Can you have a read of thiss thread and give us a bit more info about yourself, your demeanour, social situation etc - That way, we can give better advice and you earn the GC:
https://pheromonetalk.com/t/how-do-i-qualify-for-a-25-gift-certificate/19934
Also, all the basic info on choosing and using pheros is covered here and will get you going with the least wastage: