Electric: D'Addario EXL110 Nickel Wound, Regular Light, 10-46.
Acoustic: D'Addario EXP Coated Phosphor Bronze Acoustic Guitar Strings 12-53.
Bass: D'Addario EXL165 Nickel Wound Bass Guitar Strings, Custom Light, 45, 62, 85, 105.
Electric lights are usually around 9's or lower. They are generally used for faster or lighter playing and Heavy 12's are used for Jazz and rhythm playing for more tone.
If you are a beginner, we would recommend you use 10's to start out with. They last a bit longer and will help build up calluses faster on your fingers.
People who do a lot of bends may want to go with thicker strings like 12's as to not snap a string. A more finesse player that does bends can
Remember, different string gauges will put different amounts of tension on your guitar's neck, and the neck will need to be adjusted to compensate for those changes if you change gauges. So, if you had your guitar set up to play great with 9's, and you put on 10's you will need to adjust the neck using the truss rod for the extra tension from the thicker strings.