1) How does wind direct a flame? By blowing from a certain direction.
Likewise, when you breathe, you are concentrating and focusing on the flow and direction of energies. Your inhalation should be longer and profound, drawing the energies up into your mind and heart, such as with Ham-Sah.
With mantras, you prolong each vowel and syllable, directing with your willpower and imagination those sexual forces inward and upward throughout your physiology, psychology, and Being.
With specific vowels, you direct the sexual force towards those chakras, so as to enliven and inflame them. However, we must always pray for divinity to wisely guide and orient our creative energy, since the Divine Mother knows best.
2) No. Just because you are virile doesn't mean you were an alchemist. The amount of vital currency one possesses is a result of karma, which is complex and contingent upon an individual's behavior, conditioning, and his or her varied and unique experiences.
3) See the link below:
For thirty years I sought God. But when I looked carefully I found that in reality God was the seeker and I the sought. -Bayazid al-Bastami