Welcome to the Guild Patrick Cook! GIMP is a powerful program, and a great choice for software. There are loads of tutorials written for GIMP here as well. If you want a quick rundown of some of them, check out the "Tutorials in PDF Format" sticky in the tutorials section. Once you are ready to begin, create a map WIP page and post frequent progress updates. This is a great way to elicit constructive feedback from more experienced members. Let us know if you have any specific questions.