Hiya - Welcome to pherotalk. 
Can you have a read of this and tell us a little more about yourself and how you would like pheros to help you:
https://pheromonetalk.com/t/how-do-i-qualify-for-a-25-gift-certificate/19934
That way you will earn yourself a GC to help with your first purchases and we can have something to offer better advice on.
Also this thread:
Which gives the lowdown on choosing and using pheros effectively.
As for your friend - IMO, TUTH may not be the best choice, unless you are already in a sexual relationship or very close to one. It can help, if well buffered by socials like Instant Shine, IO or IG but if she’s not got the basket of feelings that make her ready to go to the next level, there is a good chance that a very overtly sexual product like TUTH will actually work the other way and drive her away from you.
Initially, I would suggest you look more closely at the socials - IS, IO, IH or IG and maybe a balanced attraction product like Ammo but tell us a bit more about your situation so we can have more insight.