I need help with these 4 letters, P, B N, M, and W

I need help with these 4 letters, P, B N, M, and W With P, I either repeat the letter or I can't even make the sound, like you can see me struggling to just say P occasionally. With B, it's the same as P. With N, the short N sound is long like "nnnnnnnnnnn." With M, it's the same as N. And with W, it's the same as N.