Secondly, I find it’s a great help to dream and/or daydream: use your imagination to visualise the scene and the characters, putting yourself amongst them.
This is all good advice. I would add two things. First, stay fit and healthy. One of the worst things for creativity is to be suffering from an illness, which depletes both your physical and mental energies. Secondly, I find it’s a great help to dream and/or daydream: use your imagination to visualise the scene and the characters, putting yourself amongst them. This is where the real writing takes place: in your head. The rest is just the mechanical process of banging it into the computer. Oh, and please ensure that your computer is reliable!