Hello new here and sahm mom of 3:)

Hi... so Im new here and Im hoping to get down to 145 for my first goal....I had a baby 5 months ago an still have 12 pounds to go and then I'd like to drop 15..... IM starting thursday...my dvds come in... IM doing jillain 30 day shred and burn fat boost metabilism....with 3 days a week on my treadmill....Along with a 1200 calorie intake.... IM hoping to drop this 12 by my birthday next month! I have confidence I will do it:)