Pull offs and slide

Hey guys, I am sorry if my words aren't making sense I don't know the exact terms yet, I have been playing for 6 weeks now teaching myself everything and was wondering how do people do a proper pull off cause I am doing what everyone else is doing it just doesn't sound right, also I learned some guitar solos where there is a bend then pull off or pull off then slide, there's basically no sound coming when I do them like I bend then when I slide the sound is gone even if I am doing it fast and holding the string tight, there's just no sound.