how do i load a map a character can walk on with a short amount of code

You mean loading a map AND a character player?

yeah

i already have a character

With a small amount of code ..... not so much. How did you make your character and map? If you made them in the smile tool editors and saved the map as layers, it isn't too bad. However just putting the map and a sprite on screen doesn't mean it will automatically have gravity, or have the sprite move around or bump into walls. You have to code that part too.