Try out different strumming patterns and rhythms. Once you're able to produce a good sounding chord, try strumming it at different tempos and rhythms. Rhythm is based on your strumming pattern, and how long you're holding your notes. Try a basic 1-2-3-4 beat, otherwise known as a 4/4. The number on the top represents how many beats there are in the measure. Try strumming up and down in different progressions to create a different sound for your rhythm. Once you get a basic rhythm down, you can start to incorporate quicker or slower strumming.
Learn how to read guitar tabs. Guitarists have their own system of music notation called guitar tablature, or guitar tabs for short. The basic idea is to look at each line in the "staff" of the tab in the same way you look at your guitar. Each line corresponds to a string, and each number tells you which fret to hold down when plucking that string. For example, to play this tab-notated lick from the Lynyrd Skynyrd song "Sweet Home Alabama," you would play two notes on the open D string, the B string at the third fret, the G string at the second fret, etc.
Beginning Guitar Class - Open to all beginners age 13 and up, or intermediate players who want the review. Begins with holding and tuning your guitar, names of guitar parts, and quickly progresses to chords, scales, tabulature, and playing basic songs. A variety of styles are introduced to encourage students to explore and find the styles they like best. Classes are organized according to age and skill level, so it's an easy way to make new friends too. Classes start every month and may be repeated as often as you like. Cost is $70 per month (4 hours).