Thanks everybody for your welcome

@ Wombat: Till a week ago I used to draw my maps just with pencil and pen, but I think that if I have a global idea of what I want to do, using straight graphic programs is the best way to save my time. I am a hairpslitter man so I usually need to draw, delete, draw again and delete again and this can take a lot of time if I have to complete my map on paper than try to find commands on my graphic program to colour it on my PC
In any case it will be a pleasure to start this journey together, even if I've never use Adobe or something like that, so it coul be a problem