From what I understand, angel investors are usually private investors, average $25,000 (minimum for C Corp I believe in Washington state) and have $1 million net worth.
You can find quite a bit about the process and from Alliance of Angels. Here's a copy my former colleague posted of their sample pitch deck - http://www.slideshare.net/BryanStarbuck/alliance-of-angels-pitch-de....
Finding them involves networking through first family and friends and by joining local tech or invetsor groups, at least that has been my experience.