Tips for skintone, acne scars and dark circles . Please help !!

Hey, I used to have fair skin tone years ago. I have never used any sunscreen and used to deal with acne all the time because of my sedentary lifestyle, binge eating and zero exercise . I went to couple of dermatologists but they were just trying to exploit and suggest expensive procedures and it failed too . I want to learn about skincare routine as I'm new here about having a lighter, glowing skintone, tips for reducing acne scars and dark circles under my eyes . Not looking for instant results, but wanted to make it a daily routine . Thanks in advance :)