B playing - Many styles?

Hey , im pretty new to the b, played about 1 and a half years. Only realy in a band for 1 - (Shcool band , mainly jazz). Just need help on creating b lines , need to know for many styles , somtimes i have a great idea im my head i can hear it soo clearly what i wnat to play under the melody but i cant seem to transfer that to the b - also soemtimes the conductor ofthe jazz bands wants little rans anyone know any good ones which i can use time and again and memorise - Cheers, Blair