First, I am using GIMP, and I am a newbie.

I want a World Map that I can zoom in on regionally and not have it pixelate so badly. However, I don't want something so large that I can't share it with the community. I am currently working with 2,000 x 2,000 at 100 dpi, but this doesn't quite seem to cut it. Will making the image larger aid with pixelation, or should I simply increase the dpi? What are the limitations on file size and scope for uploading? Should I just create individual regional maps? Any help with this matter would be greatly appreciated. I am new to map making and GIMP, and I want to have a clear idea of what I am working with before I begin.