You asked for tutorials on making charsets and facesets with GraphicsGale, of which there are hardly any. When I say hardly any, I mean next to none. I've come across maybe two tutorials for GG over the past few years within the RM circle, and I don't recall if they were very informative. So I suggested following along with the PS tutorials and applying what you learn to GG, assuming that both programs were relatively similar. However, Archeia pointed out they are pretty different from one another, so using PS tutorials to learn GG may be difficult.
Thus my above post, wondering why there aren't more tutorials for GG. Most tutorials you will come across for spriting, editing, creating are for PS. Since GG is a free alternative, and most people recommend GG, and a lot of people have asked questions in the past about GG, you would think finding tutorials on using GG would be a lot easier, but sadly it's not. For whatever reason, there are countless tutorials on using PS for your RM needs, but very little on GG.
Edit: Thanks, Archeia, for pointing out the Pixel Art sites. I might have a look there myself. One of the reasons I've avoided GG was because of the lack of tutorials, but I may give it another try when I have some time.