Hi Michael - Welcome to Pherotalk. 
Good to see you are giving pheros another go with the appropriate research. It really does pay dividends.
Have you read this thread? It gives all the basic info on choosing and using pheros effectively:
As you state an interest in A314, have you a clear idea of how you want to use it and if you can be congruent with its significant status signature? A314 is not really a beginners phero and it may be that the likes of IG might be more suitable for someone your age?
As for your questions, yes I’ve used them all and I will say that IMO, the oil is way ahead of the spray in a number of ways. The main ones are subtlety and longevity. A dose of A314 oil will see you through the whole day (esp if applied over lotion) whilst the spray will give-up in around six hours, although the effects are a bit more present initially. It also takes a while to adjust to the A314 oil but the effects on my status and standing at work are still changing and improving well over a year down the line.
Also, for long term use oil does work out as far more cost effective. At a fairly typical dose of 2-3 drops per day, a bottle will last several months, whilst the spray lasts for 40 shots and thats it.
As for your interest in self effects, yes there are a number of pheros that can help boost confidence and help your feelings and attitudes. All the none-based pheros will give a healthy confidence boost, mild with Ammo, rising to strong but with potentially negative aspects with IJ. A314 oil has remarkable and long lasting self effects and yes, Instant Shine can give you a good mood lift. However I would advise against becoming reliant on it as we often see someone come along singing its praises but after a few months finds their system has got used to it and the effects diminish.
If you have the slightest concern there may be a medical issue, you should get that checked as there are far better long term effective treatments and management methods.