One of the most important things is having a good place to work. Some people go to coffee shops. It's too noisy for me. Even the library can be too distracting. Some people write at their kitchen tables. Some write while on the sofa or their bed or the floor.
Make sure your chair is super comfy so you can work for HOURS! Remove your obstacles. But don't make the mistake of waiting for your den to be perfect. Perfection kills a lot of novels.
Here is my den:
What makes this space work?
My recliner sees a lot of writing as well.
--I'm Blogging from my recline now!