Here is a rough budget for building a gaming PC with your budget of $2000:

$1200 - GPU, get a relatively nice one, but don't try to impress your friends. You can find reviews online for how different GPUs compare for the games you play.
$250 - CPU, get a mid-tier CPU, you don't need the most recent or expensive one. 
$110 - Motherboard - check that it works with your other parts
$90 - RAM - probably 16-36 GB works well
$80 - Case - Make sure to get one with enough airflow for cooling your parts
$120 - Cooling - either Fans or an AIO (All In One) unit. 
$130 - Storage - either get one 4TB SSD or a smaller 500GB-1TB SSD for your operating system and a separate HDD with storage for games. 
$10 - Thermal paste for your CPU, if it doesn't come with your CPU already,
$130 - Peripherals like mouse, keyboard, or monitor, if you don't have them already.

These may change depending on what you already have and what specific games you want to play, plus what the current market for these parts is.
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