I don't have and am doing bad on university because os this and because of living alone probably.
I went on many phases of putting lots of things on a list and doing nothing, currently going back to basics and doing two things until I can do them consistently and call them a routine, before adding a third thing... I am not schedulig things yet (remaining flexible cause it overwhelms me having a time stamp), perhaps in the future
But about your worry, I am gonna be illustrative here. I am sure that your are doing great, being worried shows that you are conscious about your childs need which is a great sign, so be gentle about yourself. I was probably raised by a mom with adhd or autism, only my brother was diagnosed on the spectrum as an adult. She didn't like or couldn't have structure, so I didn't realize until later that I needed that, her mathematics habilities are much better than her cooking ones haahah. Even so I feel like her care and support outstand her flaws, and her attitude and kindness are important as well.
So, in short, you are one step ahead by knowing that you have adhd and that children will benefit from structure, so be gentle to yourself in your process to find a routine to your family.
PS: Instead of looking on the clock, perhaps start by connecting one activity to another like bath after dinner, or brush teeth after breakfast?? I hope I can do this myself ahahha