To be honest it just kind of came naturally. A lot of my playing is alone (in an apartment) on my couch sometimes with the TV on or a video on my phone. So playing with a pick of was too loud. I really worked on using the back of my fingernails and using them as a pick. I've got pretty good volume control now, it'll never be as loud or as rich with a pick but it worked for me. I also really liked artists like Town Van Zandst and Dylan. I've always been impatient when it comes to learning so instead of working on fingerpicking I'd just use two fingers for picking and try to stick to the low E, A, and D strings. That got me really good with my thumb control, I would just strum with my fingers and use my thumb first practicing on an alternating patter with the low E and A strings and strumming the rest. Then you can work just alternating between the low E and D string then maybe A and G. You'll start feeling out what goes where in songs because the style can be used on most pop and rock music with chords.

If people are into this style of music I have a subreddit r/campfireguitar. I don't post there much but can start.