It is best to fingerpick the strings with your fingernails as this gives a better sound. You should let the fingernails of your right hand grow to a length that is comfortable for your playing e.g., 1/16" (1 millimeter) clear of the fingertip. The thumb nail should be longer. Fingernails should be shaped using a nail file (emery board) so that they have a rounded edge and flow smoothly off the string after it has been picked.
The right hand fingers are named using the following fingering symbols.
p = primary
i = index
m = middle
a = anular (ring finger)
The little finger is not used in finger picking
Start with your fingers not touching the strings, then pick the first string with your index finger (i) with an upward motion (do not pull the string outwards). Your finger should move from the first finger joint below the knuckle as shown in the following photo. The sound is produced by the fingertip and the nail striking the string simultaneously. Move only your fingers, not your hand. The i, m and a fingers usually pick the 1st, 2nd and 3rd strings.
The p finger (thumb) usually picks the 6th, 5th and 4th strings. Pick with the lower side of your thumb as shown in the second photograph. Pick with a downward motion and keep the thumb rigid, i.e., do not bend it like you do when picking with your fingers.