It's a fun game, but as already mentioned- it does require a modern to semi-modern PC, so be sure you have a PC powerful enough to play it first.
As far as RPG's go, there is really nothing difficult to them. You make a character, pick gender, race and appearance.. then pick what you want them to be, like a fighter/warrior, magic user, wizard, rogue, assassin, ranger/archer or any combination of things. These determine how you play your character- be it swinging a sword and shield with heavy armor, or ducking back in cloth while casting fireballs, or sneaking around in the shadows backstabbing.. or using a bow & arrow... etc.etc.
From there, it's all about exploring a rich, beautiful, HUGE world.. getting involved in story/plot elements, taking on quests/doing things, and building up your character. As you play, you get experience, your character grows stronger and gets newer/better gear and access to new abilities as he/she grows.