I didn't follow a guide, but there are many good ones online.

For games, really just install Steam on your main computer and the TV client, make sure Remote Play is configured to use the most out of your connection and set to the desired resolution. This is about it.

For torrents, you want a downloading client (I use qBittorrent), software that will automatically download movies and TV shows based on what you want (Sonarr, Radarr, all the *Arr stuff) and some server that will store the media and organize it in a "Netflix-like" easy to use interface, for that I use Jellyfin on my main PC.

So in short, for games, I open Steam Big Picture, select the game, I'm playing. For media, my PC downloads everything I want at night and during the day it's all there with subtitles, episodes, descriptions, etc, ready to play by opening up Jellyfin. It's mostly hands off, but the initial setup can be a bit painful if you've never used these tools before, specially dealing with the *Arr setup.