Need weight loss tips

Brittany • 2k18 here we come!!
So I'm currently pushing 400lbs but because I'm about 6foot tall it's not really noticeable. But OMG I'm feeling every affect of being overweight from short of breath to having to sit down for everything. I wanna lose about 80lbs by mid August. Any tips or suggestions? I see my doctor next week..should I ask certain questions and bring it up?