When you're comfortable with the Em pentatonic scale, you might want to investigate the CAGED system. In a nutshell, the initials represent the basic chords you can play in the open (at the nut) position. Once you've got them down, you'll find they are "transportable." In other words, the A chord (002220) is really a "barre" chord that can be played up the next by barring (index finger across all strings) the shape. So, 113331 is a B chord. And so on.

To make it easier, I toss out the C and G shapes for now, and just use the E, D, and A shapes to learn chords on the fretboard.