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1) Go to the library (this is a good start to nearly any list of things to do, by the way).
2) Sit down in whatever section includes your kind of book (young adult fiction, for example).
3) Pull a random book off the shelf and read the flap copy.
4) Write a query in the style of that flap copy.
5) Repeat until your brain starts to leak out your ears (I wrote about 40 of them).
6) Write a new query that mashes up all the best words, phrases, and ideas from your imitation flap copy.
That's it. Hope it helps. One word of caution: I'm not the best person to take query advice from. EVERY agent who saw ASHFALL turned it down at some stage: query, partial, or full. I wound up getting an editor to read it through a personal connection, and I'm still not represented by a literary agent. So I hope your mileage varies from mine for the better.
Any other great advice for queriers? Let me know in the comments, please.