30 yr old mom of 2 looking to lose the baby weight

Hi I signed up in Dec but didn't do much. I'm trying to get seriouse now and looking for motivation and friends for support. My oldest is 4 and the weight I gained from him never left and just got added to after my 2nd was born. I'm hoping to lose at minimum 25lbs but would love to lose 40. We'll see how it goes.