If you want to be a writer, you have to write every day... You don't go to a well once but daily. You don't skip a child's breakfast or forget to wake up in the morning.
The first thing you have to know about writing is that it is something you must do every day - every morning or every night, whatever time it is that you have. Ideally, the time you decide on is also the time when you do your best work.
One of the things that I love about being a writer is this. I wake up every day and I write for three hours. I wake up early. So like 6:00, 7:00 in the morning, I write till 9:00 or 10:00. I live in New York, nobody even is breathing until 9:00 or 10:00 in the morning. So, it's like my writing life is completely removed from the rest of my life.
The way I write is this: I write about a thousand words a day, a little bit more. The next morning, I read those thousand words and cursorily edit that. Then I write the next thousand. I do that all the way to the end of the book and then I reread the book quite a few times, editing as go through.