Singing tips!!! Saliva Build up ?! Emotions?! Head voice?! Vowels?

I need urgent help(questions it would be a great help if you could answer any of these: I am a supremo2 / alto what does this mean ? I know this sounds pathetic but iI have the urge to swallow every time I sing because Im afraid to spit how can i prevent this ? I need tips on my head voice as in sending the air from your diaphragm to your facial ask mask IDK ? Emotions hm plain emotions? and last bust hardest vowels like :O and stuff thanks i will ask this question may times through out the times so keep checking my account