"Angel Investing: The Gust Guide to Making Money and Having Fun Investing in Startups" by David S. Rose is a good place to start. It's written from the perspective of being an investor, but it's very helpful for those wishing to raise funds as well.
http://www.amazon.com/Angel-Investing-Making-Having-Startups/dp/1118858255
Michael is right, "Venture Deals" (second edition) by Brad Feld is by far the best book and includes a sample term sheet. It is less about angel investment but they do cover convertible notes. http://blog.ycombinator.com/announcing-the-safe-a-replacement-for-convertible-notes This is an alternative to the CN. Also, here is a link to some startup books. http://www.businessinsider.com/read-these-books-before-pitching-vcs-2013-8?op=1&IR=T
If you haven't read Lean Startup, read that before pursuing any investment. Hold on and bootstrap as long as you can is my advice.
