It's a passion. If you have a passion, you probably have a bit of talent for it. And if you have a talent, the more you do it, the better you get at it. I'm become a lot more prolific as I go along. I know how to write better.
Songs usually come in the form of inspiration.
You don't have to think about it, you just have to be open to it. When writing or recording, I kind of pick a direction that I want to go. You think of it as a painter who paints series. I tend to kind of write songs in series and they reflect what I'm living, what's going on in my life, and what I'm thinking. I'm able to write a lot more songs than I'm able to record, so you have to decide what your vision is, which direction you want to go.