As you perfect your skills you may start using some more advanced brushes, but as a beginner you should focus more on the shapes and colors of your painting instead of choosing the right brush.
For beginners, the basic brush is more than enough. Make sure to use a hard-edged brush with opacity jitter. As you perfect your skills you may start using some more advanced brushes, but as a beginner you should focus more on the shapes and colors of your painting instead of choosing the right brush.