Well done getting started with the moving process! That shows a certain motivation and a lot of courage. With this you can start with the other things too.

I would suggest pick one thing only to aim to do, eg I have to make sure I go out once a day whether I want to or not, or I know my depression symptoms will escalate. Working out also helps boost mood and make you feel better about yourself, so either one would be a good start.

If you fall down one day, the next one can be a clean slate. Baby steps are easier than trying to run.

Best wishes