I have a good exercise for beginners if you want to learn a sweep pick.

first click in you neck pick-up, it sounds much warmer

second, make sure you have exase to all the strings and your hand must be in right position

third grap an E minor chord starting from your 12th position

E---12
b---12
G---12
D---14

and try to sweep it note for note untill you can play it every time you jam with others

BTW make sure you mute your strings

see ya :D