20 at 159lbs! Need friends for support

I'm 20 and weigh a 159lbs. Would love to lose 25-30+ lbs. I have 2 girls 4&1. Used to be 135lbs but after my last daughter I've gained a lot of weight. I'm still young but this is the heaviest I've ever been and overweight for my age. Would love to get fit and healthy again. Especially cause I have health problems as well. Would love your support and some good healthy food ideas and exercises. Thanks!