Hello, Guild!

I'm trying to make my first world map. I'll be using only my own resources, my wacom intuos 4 and GIMP. I will also be printing this map in a 120x90 cm (48x36 inches) sheet of paper. However, I do have a few questions about this project:
  1. How many ppi should I use? I usually go for 600 ppi.
  2. Should I make the initial image 48x36 or is that too big? I mean, the canvas alone exceeds 5 GB.
  3. Is there any template I could use here in the Forums?


Thanks in advance. I'll be posting my WIP as I go, in order to receive your valuable feedback.