What i would LIKE to do, is something like google maps, where you have the overhead view, but can zoom in to see a closer view. not exactly to the level of detail in google maps, but to a topographical point where you can zoom in on where a city/town/village might be. i dont need the program i design this with the have the functionality of google maps, i just need something that will let me design an entire planet with i little bit of detail for zooming in.

i have no idea what program i could use, i'm very new to this world/map designing thing. any and all tips and suggestions would be helpful immensely.

i actually have a fair bit of detail written out for this world, if someone was even willing to design it for me that would be awesome.