If your parents didn't have any children, there's a good chance that you won't have any.
When I write for 'n+1,' I begin by doing a lot of reading, to try to convince myself I'm not stupid. Then I scribble down a paragraph here, a paragraph there, when a notion strikes. Then I see if I can arrange those notions in a way that yields an argument.
Invented languages have often been created in tandem with entire invented universes, and most conlangers come to their craft by way of fantasy and science fiction.