First, I’m going to put some words on the page even though I don’t have a concrete idea of what to write about.
Then, I’m going to ramble on some more, unedited, just so that I can get some more words flowing.
After a few sentences of doing just this, maybe a write-down-worthy idea will come up (finally).
Or maybe not, which is fine too.
Starting doesn’t mean you have to take newsworthy steps towards your goals, it just means you have to begin where you are. And if that means starting a sentence without really knowing what you want to say, so be it.