Hello, I'm trying decide whether to purchase this software, and if so which version best suits my needs.

I am not a graphic designer.

I have written a manuscript which needs simple black and white maps. In order to avoid copyright issues, I want to download a map image, trace it but modify it so that it is legally different from the downloaded image. (I will reference the source with an, "after image so and so".)

Is this the correct software for this task?

Is what I wish to do difficult?