@SchildConstruct: Many, many thanks for your donation! I think I could learn a lot watching your PSD file, but I'm a Linux guy and I'll go with GIMP and InkScape, I think. Moreover I don't think my skills will ever justify the costs for PS licenses! I could try to open your source file with GIMP and see what happens! :-)

Many thanks to all of you guys! Yesterday evening I took a glance to you "Getting started" topic and I discovered a whole world! I'm eager to delve into map making now, just because I don't have enough stuff to do all days... it will be a sloooooow way to go! My experience with graphics dates back to CS2 suite, now that I'm on Linux I have to learn how to use new tools but I'm sure they could do the job!