I need some advice or help

Je

So my youngest will be 2 in april. I have 3 older kids. I've had the mom pooch for 8 years. Never been able to get rid of it. Well I just started a weightloss journey, since I now need to lose atleast 100 lbs to be at a healthy weight. How do I shrink the pooch? :( Which exercises are best? Should i get a waist trainer? Help please