Is there a grammar rule or copywriting rule on starting a sentence with a number?

Is it correct to write:

10 eggs are in the nest. or Ten eggs are in the nest. ???

It is generally accepted that a sentence started with numerical quantities should be written in words, i.e. Eight years of daily instruction in english grammar, and composition, and so on.

I'm considering going to the Chicago Portfolio School for Copywriting, is this a worth while school?

Technorati Tags: Copywriting, Eggs, English Composition, English Grammar And Composition, Grammar And Composition, Grammar Rule, Numerical Quantities

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