While the above comments are true, there is also nothing stopping you jumping in at the deep end and trying to make something like this! I mean, it's a great way to learn all about the different systems that are required by just about any game, so as long as you are aware that the task is going to be a long and challenging one, then go for it (but also be prepared to put it on hold and make smaller games to get familiar with GMS and programming in general!). Just take it a step at the time and break down what you want to do into bite-size tasks, like "movement", "attacking", "enemies", etc...
That said, written tutorials for this kind of thing are VERY hard to find, as written content takes a lot of time and effort to produce, host and make available, while video content is much faster to produce and host, so you're probably stuck with checking videos on YouTube. I know a few developers have done RPG tutorial series on their, just do a wee search for GameMaker RPG and you'll find them. And even though some of them are for GMS2 most of the code will be pretty much the same...