transcribing to fingerpicking

is there a theory to follow? or is it just random mucking arnd? ive been mucking arnd with a song trying to fingerpick...it'll great exercise for my fingerpicking...if theres a theory then it wud be easy but i have no idea...might be a stupid question but ah well...

cheers

Can you post a tab of the song? What ive been doing is using my thumg for the E A D strings and my other fingers for the G B E strings. This of course is depending on whether the part i am currently playing is an arpeggiated chord or not. If its a melody sequence then i use only my index and middle fingers.

Seeing the tab would help though.

its originally a song with chords..so its strum strum strum all the way..i was just thinking that maybe i can turn it into a fingerpicking song with the same rythm...or maybe tweak it to my liking...but yeah basically i just want to change it to my versionof fingerpicking instead of strumming...i just thought that maybe theres a theory for fingerpicking...come to think of it this is a stupid question...but yea was just wondering if theres theory for transcribing...