I want to lose weight!!! Tips!

So I'm 20 years old and I just gave birth to my second child 3 weeks ago.... I'm 5'2" and about 160 lbs (my BMI is 29.3, I'm overweight)

Where do I start? First step is to give up cereal and soda, but what else!? Blah, this is terrible! I used to be so thin, now life has taken over. I feel so ugly.

Before kids

After

My husband and I run a podcast and that picture is in our office... I look terrible. I want to cry. I'm fat absolutely everywhere from my body to my face