I establish a routine a stick to it.
I wake up every morning at 7:30am
Exercise, when I exercise I feel as though I am about 2x as productive that day than on the days which I do not excercise.
Write down a task of things to do, I use the pomodoro methods to track all of the things that I need to do in a day.
I use to eat infront of the computer, I realized that when I did this I would often start watching netflix or other shows and once its started.... well it was hard to stop.. Not going to lie though I was hooked on game of thrones for a week, season 1 to season 2, I came to this epiphany when I reached the end of season 2...
Take breaks, even if you don't need it, take regular breaks, I noticed that it increases the longevity of my mind.
Coffee or tea, pick your posion. I love tea but coffee makes me jump off walls and I get worse A.d.d
Organize organize organize.
Can't afford or don't have room for a filing cabinet? Goto staples or office depot, heck even check out craigslist and you'll find small portable filers that you can buy for super cheap. throw in some folders for 5$ and your golden.