To sing you just sing right well I have some warm ups for you. Ok so you know DO Re Me Fa Sol La ti DO, well instead of that sing DO re DO Do re me re DO just go all the way up until you get through the whole thing then go back down. If you don't know how to read sheet music try listening to a lot of songs then when you sing a song you will know the notes basically. For a challenge go ah ah ah ah ah sing it but comment down below how high you can go. I can go all the way (sometimes when I don't hurt my voice from breaking)( it breaks a lot).