I second what DLDMIL said. For a week, just do what you normally would do, and increase accordingly. That's what I did.
More specifically, I calculated my average daily steps for that first week, and rounded up to the nearest 1,000—so my first goal was only 7,000 steps, because I was pretty sedentary. I waited until my average daily steps were consistently over 7000, then I increased again by rounding up, and so on. It's a gradual approach, but you keep going up, and I think it's more sustainable than making a large, difficult goal.
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