Neko, an RPG is just a normal game with extra elements thrown in. If you want to make an RPG, first decide what type of RPG you want to make (turn-based, top-down, isometric, swords, guns, cards, etc.). Then, work on the base game first and expand from there. It IS possible to make an RPG even as a beginner... but only if you take it one step at a time (and don't give up as it's going to take MONTHS to make it).