Now that you have reached a comfort level with strumming, playing chords, and single-note playing, you should start to think about the kind of sound you want to get out of your instrument. Sound is a personal thing and is heard in a different way by every musician. To get the best sound out of your guitar, you may want to consider getting an amplifier. You may feel that an amp is an unneeded expense but its impressive effect on the quality of your guitar's sound will (hope-fully) change your mind.