Regular to heavy gauges
.010, .011 for first - E string
Acoustic guitar strings
Light gauge
.011 or .012
for first E - string
Medium to heavy gauge
.013 first - E -string
When buying guitar strings, most people will use the gauge size of the first E string as a reference guide for the whole pack. In other words, if you go to a music store and ask for .009 gauge electric guitar strings, or ( 9's ), the clerk will know that you want light strings.
Most beginners should start with a light gauge string. As your fingers become stronger and more callused, you could move up to a thicker gauge if desired. A thicker gauge will produce a deeper tone that some guitarists prefer.
However, keep in mind that a thicker string will be harder to press and bend.
You will figure out your favorite brand with a little trial and error.
A few popular favorites of mine and many other guitarists are:
Martin
Dean Markley
Fender
Ernie Ball
D'Addario
See the resource section to see string options, popular guitars, amps, and accessories.