A fun question I like to ask fellow entrepreneurs or creative types is: "When do you do your creating?" Some people have the awesome luxury to create all day and can schedule it like a 9-to-5 gig. Others need to be in the right spot at the right time with the right tools for inspiration to strike.
For me, I create best first thing in the morning. Refreshed from a good night's sleep, I take advantage of a quiet house and hot coffee, crack open the laptop around 5:30 and write for an hour. I don't read. I don't check the incoming. I force and push myself to create.
I write, even if it sucks. I brainstorm, ideate, and notate. I produce. Mornings are for creating.
You need to find the time and place where you create best. Then, plan your schedule around that time. You'll make better stuff, have better ideas, and get more done in those hours where you're dealing with the inbound and putting out fires.
Let nothing stand in the way of the chance to make something amazing.