Wanting to get more active and healthier

What is your best weight loss tips and tricks? I'm 26, around 330lbs, and 10 months postpartum with PCOS. I was around 380-390lbs, then I lost weight while I was working fulltime retail. I got down to almost 300lbs (pre pregnancy) and now have an extra 30ish pounds to lose again on top of the 100 more pounds I want to lose. Any advice for a stay at home mom?