6 Picking Exercises
Download the tab HERE.
Before you play a scale or song, I think the best way to get into the groove is to make sure your plucking hand is in sync with your musical mind.
If you are a beginner, you should go slowly and work on striking each string you intend.
If you are a more intermediate player, you could work on increasing your speed with the help of a metronome.
If you are an advanced player, you can work on emphasis, and pluck certain notes louder than others.