|Todd Stewart Contributor|
Set aside time each day, at the same time. Start with 30 minutes.
First, go take a 15 minute walk outside. Walking stimulates your brain and makes you more creative.
Come back inside. Get rid of any distractions, including browser tabs (I like using WriteRoom). And sit down and write.
Don't beat yourself up if you don't get much done. Like anything, it will get easier with practice, and like anything, practice will be easier if it's a regular routine. Don't beat yourself up, but also don't allow yourself to give up before the 30 minutes are over.
Write what you want to write--remember you don't actually HAVE to write scenes in order. (None of the professional writers I know start at the beginning and write straight through until the end on every project, and most of us don't do that on ANY project.) If there's something crying out for you to pay attention to it, write *that.*
If you get in a groove, and you don't have anywhere to be, keep writing until you get tired.
Make yourself an outline for what you want to write, too. Then you can cross off sections as you get through them.
Jessica has some really great ideas here.
I'll chime in and double down on the idea that you don't have to write something in order. I never do. If a particular idea in a project comes to mind I work on that. If I'm writing a story, any particular scene or even a stray line of dialogue that happens to pop up first, that gets written, and then I'll frequently just jump to something else not even in the same scene. I splice together dozens of disconnected portions later on.
I typically write something every day, but there are times when it just isn't happening, and unless I'm under a deadline I don't try and force it. But if I'm in a creative mood, I'll boot the cats out, close the door, and just keep writing until I can't.