> I have the dual issues of poor time management and trouble focusing when my mind wanders and wants to do something else.

I've worked a lot on these for myself and ended up with a process that's extremely similar to the article here.

Remember that changing your habits is hard and takes time: rather than changing everything at once, it may be better to build on and try to gradually improve on your existing routine. I'm not sure I could have successfully implemented all of this advice overnight, yet I've gotten there by building up good habits over time ('habit stacking').

I believe the exercise is perhaps the most important part of this: getting regular exercise helps you to keep good, consistent habits.