I have been playing guitar for too many years now I care to remember. The plectrum commonly know
as a pick or plec has been an essential part of that process. There are of course many different types of pics that you can use and im going to give you a little guidance to where I feel the best one might fit your needs.
The Nylon Pick

This texture of plectrum I have always liked is the nylon pick. It has a really nice feeling between your fingers and gives a good connection with the strings. There are many different thicknesses to choose from .38 .48 .60 .73 .88 1.0 and 1.114.
.38 is a very light pic that is generally used by the beginner player or by a advanced player that is looking to control the output of the instrument because they are accompanying another instrument or voice.
The beginner likes a soft pick due to its flexibility, allowing the player to strum much more easily and focus more on forming the chords on the fretboard.
.48 has still the same flexibility but also gives a slightly firmer connection to the strings. I would only use this thickness if i had nothing else and didn't want to cut my finger to bits or if the guitar I was playing had a light gauge of strings on it. Gauge 12 to 13 can feel really uncomfortable to play with the lighter pick as they need a bit of strength put behind them to get the sound out on an acoustic instrument.
.60 is a very popular gauge with a braud range of players as it has a firm feel but also has a bit of give with the strings. This gauge is used a lot by banjo, mandolin, Mandola, and Bouzouki Players. As these types of instruments require the player to do triplets and fast picking the pick can really adapt to the playing style of the player. The Dunlop .60 nylon pick or fender brand are bread and butter in a guitar store. I would say that its thee most popular pick that sells in Music Minds