You should, no, you must buy TES III + IV + V. That will be an experience you certainly won't regret. Even Morrowind is still an amazing game, even though it was released more than 10 years ago.
You don't need to buy anything.

Happy pirating.

Lol that's just hilarious. Going through the hassle of finding a torrent and downloading for weeks because noone ever seeds if you can just go and pick up the games for 10 bucks on Steam and DL them over night at full speed is something only people with absolutely no money at all still do.
Heck by playing Team Fortress and CS:GO and selling the item drops on steam you can actually fund your gaming by playing games.