How do i start my personal journey?

I want to start off first I have depression and I have a thought disorder. Honestly it makes me feel sad because my mind would be in another world. I'm on three meds abilify citalopram, and risperdal. Personally I like to listen to this song by heather small called proud. Can you all help me because I need to lose a lot of weight. What should I do first , I also have lower back pain and that's the first thing I want to get better. Thanks.