New Here :) - does this seem right?

Hello All...

I'm new here.  I'm so glad I came across this website.  I'm now totally committed to losing the weight I need to lose.  I have been battling with the "I'll start on Monday" excuses for the past 5 or 6 months... have had a gym membership for almost a year - but have been there less than 10 times...  I woke up this morning on a mission... not caring that it wasn't 'Monday'...

I am 30, mother of 4 (9, 6, 4, and 2), am 5'1 and weigh 170 lb.  Using the tools on this site, I have worked out my daily caloric intake to be 1650 - I started a workout regimen today too.  I 'want' to get to 120 lb.  Losing 50 lb by March 1st is reasonable according to this site's standards. 

This is my first shot at REALLY getting into a diet/excercise routine - with CC being at the helm... to you avid CC'ers, do my numbers seem right? ... doable? ...etc.?

Everyone's support, thoughts and opinions are welcome and very much appreciated...

Yours in health...

Nyah