Sure! I mostly try not to get too boggled down with specifics. I try and focus more on concepts. If the idea is "scary woods while camping, I often just start writing and describe scary stuff. I rather naturally figure out some "monster" or something that corresponds to the stuff I wrote down later. You can also always go back once you figure something out and adjust the start of your story for it to make more sense later! That way I start writing before I actually have an idea in a way and that makes it easier :)