Close your eyes and travel through time and space, far into the future or many years ago into the past. Prepare to visit a land you have never seen and a culture that is very foreign. It's new. It's exciting. You can't wait to begin . . .
But wait, bring yourself back to earth for a moment. As a writer, you have much more work to do before you dump your character on a strange new planet or into a castle that once existed long ago on earth. Aside from deciding how many moons and suns are in the sky, think about the landscape, weather patterns, the history of the location, and the type of people (or things) that live there. If you are writing about a land where it never rains, would it make sense for your character to have to fight his way through a jungle? Probably not. Draw your landscape out if it helps you. What does the ground feel like. If people live there, where do they live? What are their eating patterns? What is the culture like?
While natural laws may be different in a new land, they cannot be non-existent. As a writer, you must have a set of natural laws as well as cultural rules that are followed by the new society before you before. Your character may be discovering them for the first time, but they shouldn't be a surprise to you, the writer. Working out all these details early will save you time editing your writing later on.
WRITING PROMPT: Create a new world with a different set of rules (culturally and naturally). The new world can be on earth or on another planet. It doesn't matter. Draw it out or find a photo online that looks something like you would like to portray. Put the list and the drawing together before you start writing. Then introduce your character to the scene and watch him react.