Novelist PJ Parrish offers some very good advice to aspiring writers under the heading "10 Things You Should Never Worry About." Among my favorites:
7. I’m querying an agent. Should I send my first chapter or my best chapter?
If your first chapter isn’t your best chapter, you’re in deep doo-doo.
8. Who should I dedicate my book to?
9. Should I include my picture with my submission?
Only if you’re Brad Pitt or his wife old whatshername.