$ sudo apt-get install audacity
Well have not done anything yet, Have to overcome an impairment in my left hand to start playing again. Just takes some practice. As an incentive, I have to practice everyday or the guitar would be taken away. Here is the guitar which was purchased for allegedly five dollars. Pardon the picture. Hope to have an update soon.
Not my tutorial but it might be a good start.
You may need some kind of adapter cable to plug the guitar into the computer.
You could also get a book of harmony to help you alon or even a guitr instruction book.