You can practice these sounds CH, SH, WH with this cute song.

Hey look what I found
Wanna share It with you
Transformer H
Can't wait to show you all the things it can do
Hey!
When it comes behind the letter
C, S, and T
It changes up the sound, stick around, you'll see what I mean.
C all by itself, makes a hard sound.
"kuh."
Transformer H comes around with a new sound.
"chuh."
It turns cat into chat, case into chase, cow into chow.
I think you got it now.
Yeah.
S.
Oh, yes.
You don't have to guess. You don't have to guess.
When it's all alone, it makes a sound like a snake.
"ess."
But add the H and it's a whole different thing
Sake turns to shake, same turns to shame.
Oh, yeah.
And last but not least, is
"t-t-t- t-t- t-"
By itself, I tend to think it is hard as can be.
But when you add the H, you see
tick becomes thick, and tree becomes three.
Oh. Transformer H.
Ooo, ooo, ooo, ooo, ooo, ooo, ooo, ooo.
Yeah.
Ooo, ooo. Whoa, oh.
Come on.
Transformer H.