making a new map

[Spartan]

Hi! just new here (sorta) and i played a canny few of the maps on zombie mod server. I was thinking of making an escape map, but im still sorta basic on how to make a map but im hoping to make a project so i something to do! . give me your ideas on what u think would make a great map, and maybe some tips on how to make things better, or improvments and all that crap