A lot of info in the spoiler below
http://www.pcpartpicker.com Useful for putting your own computer together. Helps by automatically making sure your parts are compatible with each other as well as listing the power required for your system and generally chooses the lowest price for the part from a list of about 10 websites.
http://www.game-debate.com Useful for looking at how well parts do in gaming. You can test how well a CPU and GPU setup will do in nearly any game. Quick note: For Farming Simulator 19, the graphics portion seems on however the CPU portion seems way off or switched around from what it should be on the recommended vs minimum settings.
If you're unsure about a system or looking for more help, then please post below and I'll be sure to take a look.