You're correct that we'll start drawing daily BINGO numbers on the first of March. We will draw one number each day, and you will have 2 days to start a response to any prompts matching that number in order to claim a stamp for that prompt.
But there's certainly nothing to stop you from starting on the prompts now; I know a few people at least are coming up with ideas. The only caution I'd issue is that only 31 numbers will be called--less than half of those possible--and so you might start a prompt for a number that is never called. But if you don't mind that, then I'm never going to stand between a writer and her plotrabbits! :D Also remember that pieces posted publicly before the number is called are not eligible to claim a stamp.
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But there's certainly nothing to stop you from starting on the prompts now; I know a few people at least are coming up with ideas. The only caution I'd issue is that only 31 numbers will be called--less than half of those possible--and so you might start a prompt for a number that is never called. But if you don't mind that, then I'm never going to stand between a writer and her plotrabbits! :D Also remember that pieces posted publicly before the number is called are not eligible to claim a stamp.