I Use:
Medium gage (105-50) Yellow Packet
Medium Lights (105-45) Orange Packet
Ernie Ball Slinkys.
People do use Extra Light (Blue Packet) depending on the style of music you are playing, But if you stick with light/medium (Pink-Orange-Yellow packet Slinkys) you wont go far wrong with what ever your doing, just remember changing gauges will affect your intonation so if unsure get it checked, or you will just sound out of tune all the time