This falls under that umbrella of "executive functioning" which is actually one of the signs and symptoms of someone with an ASD. I can only share my experience with this,...loss of focus, distractions, busy doing a lot of things, but never getting anything done, etc. What I do, and would suggest, is at the beginning of your day, YOU make a list of the handful of things you wish to accomplish that day,...with little check boxes. You can do a piece of paper, a dry-erase board, whatever,...but have it in a place where you are most likely going to see it,...the refrigerator, the computer, etc. It is just an aid to keep you "on task".
Habits, both good and bad, are often a result of repetitive behaviors over long periods of time. Whether it be hygiene, dietary, exercise, study, household chores,...whatever,...if you are attempting to change an old habit, or create a new one, it can take months. After several months of creating a new routine in your life, often, you don't have to actually think about it too much.