To the question where is my GPU, it is an APU, which has a integrated GPU into it
I wouldn't mind buying used parts, but I am limited by where I live, but I will look into it
To the settings and games I want to play on. I would like to play 30+ FPS on more casual games at any medium (Witcher 3, Skyrim) and 60+ on any settings for more intensive games (MOBA's, CSGO, Rocket League)
I chose this build because the main game I play (CSGO) is CPU intensive, so I can save money buy buying a 2 in 1 deal.
Once I get into more GPU intensive games though I plan to get a GTX 750 ti