Every worry to its proper time and place. Now--"You are staring at a blank screen and a blinking cursor" now--none of those worries are relevant. You will burn those bridges when you get there. Right now, put the words down. They don't have to be good. Start anywhere.

Once you have enough words you can ask yourself if those words say what you want them to say, and sound like you want them to sound. Yes? Ok. No? Bang your head on the desk until you figure out what the words should actually be. (also eat, drink water, take walks. It actually helps!)

I feel like the starfish could be a viable alternative even at this early stage.