In my experience as a guitar instructor I have found that many beginning guitar players learn how to play chords on the guitar, but aren't sure what to do with their right hand. 

This brief video gives a quick rundown of a basic strumming pattern for both 3/4 and 4/4 time songs as well as the basics of fingerpicking. For more in-depth videos:

Strumming: Basic Strumming Pattern

Fingerpicking: How to Fingerpick on a Guitar

 

Guitar Instruction by Seth: Strumming and Fingerpicking on an Acoustic Guitar