The PIMI is a basic and easy picking pattern that also sounds really good. Practice is with these easy chords and just a couple of fingers in the left hand.
This video tutorial shows you the basics of how to read and write tablature aka TAB.
Learn the natural first notes on the first two strings in first position. Soon you will be able to play a complete C major scale.
Down-UP Strumming Patterns with the nail side of the fingers