Sometimes it can be hard to work out what it is that you want to write - you might have a lot of ideas buzzing around your head, or otherwise none at all. This is where I turn to some vital advice - write what you want to read. Simple huh?
Well, it works. If you write something that you don't like, or wouldn't be interested in, then your writing will be more dull. Your heart isn't in it, and that's going to come through to the reader as well. If you aren't enjoying it, why on earth would they?
Whereas if you write something that you would like to read, you're going to be more engaged. You will actually want to get it down, so that you can read it. You'll be able to think things through, and you'll be interested in the project.
The other side to this is that it can be very hard to get your work out there, especially if it is with your own characters. You might self publish and find it takes a while to get popular, or you might just not have the confidence to get the work out there. But if it is something that you enjoyed writing, and which you like reading, then it is in no way wasted.
So that's my advice as to what to write - write something that you would like to read, and then it has at least one fan. You'll enjoy writing it a lot more, and that enjoyment will come through.
A short and simple blog post, for a short and simple idea.
Now, a quick challenge for you: Think of something you'd like to read, and write some of it. Even if you just write a paragraph, give it a go right now and let me know how it goes!