i found learning carter style finger picking using thumb for melody easiest, i would suggest adapting this and use thumb for melody and to fill out sound with plucking the adjacent string above with index finger with very occasional strum, this works very well using c f g shapes and g c d shapes.
when you have this off learn john hurt style which is opposite fingers pick melody thumb plays alternate strings onbass. if you can get these twp styles you will be fairly advanced