Heaven, you sound like you are doing great!!!

Subway is a GREAT choice as far as fast food goes
You are doing great by cutting down your portion size too
I used to eat 3 or 4 bowls of cereal for breakfast alone.,.not to mention other things i used to eat..so after i cut that down to one ..i started noticing imporvements, so i'm sure you will too
Before you start doing exercise..try just stetching for a while every day for a week..that's what I did before I got into my workouts, it really helped prepare my body for what was ahead, and kind of woke up my body, my blood, and my muscles especially..it was a nice transition..I hope it will work for you too if you try it