Alec Greven, a 9-year-old, wrote a book on dating. It is hilarious and surprisingly accurate and insighful for a 9-year-old. Here is an excerpt:
The right thing to do when you have a crush is:
Never show off too much
Don't be silly and goofy
Control your hyperness (cut down on sugar if you need to)
Make sure you have good friends who won't try to take the girl you like.
Finally, you have to be able to get over a crush if it doesn't work out. A crush is like a love disease. It can drive you mad.
Try not to let it get you down.
You can readl more about Alec here.