Don’t worry so much if you have a natural ability to imagine. Also, don’t worry if others have
All my books have started out as an idea, an outline then I built on the outline and wrote my heart out.
But don’t forget, you need to have an interesting story, build your characters, do some research if it’s an area you are not all that familiar with and write write write
Don’t worry so much about how many words you wrote! Tell the story. There are many times where an idea comes to me from a dream, but you can get idea’s from just about anything or anywhere so go ahead and be creative!