Over weight teen advice please?

Okay so i am a 16 year old female im about 5 feet 6 inches and i weigh around 300lbs...yes i know i am severly overweight... and i finally want to do somthing about it..my dream weight is at least 160 i know it still may be overwight but its better then 300lbs...but for starters i want to get to at least 230 and slowly go down just please give me advice on what to do perferably IF YOU ARE JUST LIKE ME OR WERE AND HAVE LOST THE WEIGHT PLEASE LET ME KNOW AND LEAVE A LINK TO BEFORE AN AFTER PICS PLEASE! that will help me out knowing yall did it too. so advice please!!!!