i thought there are various method for plucking.

for me,u got to train your ears first.that's the most important thing just like how you tune your guitar by ear.then you will know which string to pluck and which note you need to hit.
im a noob anyway.but that's how i got to play most of malaysian indie bands songs.(most of the songs are easy to play.i.e:nitrus-resah and tentang kita-couple)

by the way,what song that your teacher ask you to learn?mind to share with us?