Marcia,
Congratulations on your goal! 10,000 steps is a great way to stay focused and get a lot of benefits.
I hope this isn't too long-winded; we had a check-in a while back on the ya-ya's and here's some info from there. Most of us with office jobs found that we only got 3-6,000 steps a day, so 10,000 was a good goal to work towards. Prevention magazine outlined a program that started with your daily average + 5,000 steps as a goal. For most people that translated as 10,000. But then, every few weeks or so, you're supposed to add 2,500 steps towards your goal. I don't know what the ultimate goal eventually is, though.
So many articles recommend 10,000 as reasonable for maintaining fitness. Since I don't want to "maintain" but rather "lose weight", my current goal is 10,000 steps a day (for health) plus a cardio workout (to lose weight). That's my goal, not what I achieve. Yesterday though I got 9,000 steps plus did Imax2.
btw - it took several months before I felt comfortable with 10,000 steps daily! And there were many weeks that included a day or two of only 5,000 steps.
Best of luck with your challenge! I think you'll find that you'll feel even better as you become more active throughout the day.