What are some signs that a guy is starting puberty

Pubic hair under arm pits and lower area
and a deeper voice.

boobs.
big, fat, man boobs.

Pubic hair starts to grow (that is why they call it puberty) and you produce semen when you masturbate until you have an orgasm.

public hair, underarm hair, voice deepens, you begin sweating more and it has a stronger odor, so a guy starting puberty should begin using deodorant if he already hasn't

One sure way is that you will start ejaculating semen when you masturbate, although there wo not be a lot of sperm in the semen yet when you first start

why some guys that go through puberty get a mad high and whiny voice

Deepening of the voice, pubic hair growth, things like that (penis and height growth)

hair and scratchy voice

Pubic hair comes quite early on.