ok, play with your thumb 5 string down, pluck up your 3 string with a finger, with your thumb play 4 string down, pluck up your second string, this should be 4 half beats or quavers.
repeat this 5 thumb but this time pluck up 2 string, thumb down on 4 string , pluck up on one string 4 half beats or quavers.
now repeat all this but start with your finger and follow with your thumb.
now repeat the very first description but on each first beat play two strings simultaeneously, instead of one after another, that is the basis for melody picking,try the major keys of c g a e and d, but before you melody pick you will be learning to pick to a pattern with a steady bass either on the beat[number one description] or off the beat number 2 description.