@Keenan235,
Your system is circa 2014, but it was implimented with WIN 7. First I would suggest you verify the BIOS. Is it BIOS (called Legacy) or UEFI? Go here to get an answer. UEFI cards do not generally work with Legacy BIOS.
Here is the upgrade and service manual. It explains the process of installing hardware.
Before you leap into this, what are your goals? A game requires a definite card as a minimum. Use this to determine what you need.
Later we can discuss a new Power Supply, when you determine what card.
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