Hey there and welcome.
I’m going to answer your q’s one by one - this is my experience anyway and I hope you may find the same 
1 ) Do pheromones really work?
For me, yes they do. They don’t DO the work, they just give a little extra edge when I am doing the work. That’s to say, not all give me self-effects, but if I act congruent to the image I want to give, they help promote that. IO on it’s own won’t make people talk to me, but if I talk to people conversation just comes “easier”. This is even more important with some mones - A314 in particular. You have to look and act the part. Some people suggest that if you are acting and looking the part anyway then how do you know it is working? All I’ll say is that in my experience A314 accelerates the reactions of other people. Getting them to see me as an “A314 person” takes a fraction of the time it would take without A314.
2 ) If pheromones work what is the differnce between a314 (A314 Classic Edition – Trust & Respect Pheromone for Men - Alpha A314) and ammo (AMMO – Sexual Attraction Pheromone Cologne For Men - Alpha A314) ?
A314 is trust and respect. I use it for work, especially if I am meeting senior management. For me it’s a “I’m the man. I can run things. You can trust me” vibe. Ammo is a social attractant. I find it’s a “I’m a nice guy to meet, I can look after you, and if you want to see my bedroom you can” vibe. Not too intimidating or aggressive.
3 ) What Is a good combination to try to get a conversation started?
Use each product on it’s own first to see how it works with you / find your sweet spot but then I find IG x2 + IO x4 + IS x4 works great for me. The “getting conversation started” bit will have to come from you but once you’ve started it you might find this combo keeps it flowing.
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*4 ) Is it possible that the pheromones will not work with your body’s chem?
I think so. I have had little or no perceptible results from products other people have had great results with. And I have had great results with products other people have had no results with. I don’t know if this is congruency or chemistry though. Products that are bond builders or alph-projectors work great for me, but that is closest to my own personality. When I say they work great for me I mean that they make things happen quicker than normal. This may be why I’ve had my best attraction hits from IH than Ammo - IH is closer to “me” than Ammo is.
5 ) I tried some of mikes a314 (A314 Classic Edition – Trust & Respect Pheromone for Men - Alpha A314) and did not feel any different, is that normal?
Not every mone has self-effects. A314 used to make me feel amazing with confidence and self-assuredness. That self-effect is wearing off now. IO has a big self-effect on me, making my own mix with TUTH in made me clench my jaw for an hour after because of the high exposure…but IG now has no self-effect (but remains possibly my favorite product). I’ve got no self-effect at all out of others that people like.
6 ) Are all women affected by pheromones?
I think yes, but whether they show that is another question. My LTR has almost no reaction at all. Because she is already tuned into my natural scent and I can’t change that perception? Because she doesn’t react, period? I don’t know. But this is where congruency comes in again. If you’re signature is “alpha male” but you’re not acting like one people will just be confused and not react. Same if your signature is “friendly, come chat” but your body language is closed. If your signature is “friendly, come chat” (IO basically) AND your body language is open AND you start a convo then you might find you get a reaction. See mones as giving things a nudge in the right direction…but only once you have everything else in place.
7 ) what are some of the best places to apply them?
I always go for wrists, top of head, or neck depending on how people are going to be exposed. You’d apply to same places you’d apply cologne.
8 ) how long do they last?
This seems to be down to a few factors - heat, skin chemistry, environment etc. For me, A314 seems to last 4 to 6 hours being oil, and then it varies by product - nol products seem to burn off quickly for me compared to rone products.
IO, IH - 2 to 3 hours,
IS - 1 to 2 hours,
Ammo - 3 to 4 hours,
IG - 3 to 4 hours
Anyway, hope that helps. If I was you I’d use the GC to grab and Ammo and an IS To Go size and see how you get on! 