New to building desktop help?

[Tcman2000]

Ok, I know almost absolutely nothing about building computers, compatibility, etc but I want to build a desktop.
I was using the custom buider at Userbenchmark.com and I was wondering if there is anything wrong with this build.

UserBenchmarks: Desktop 86%, Gaming 64%, Workstation 52%
CPU: 90.8% Intel Core i5-4690K
GPU: 62.1% AMD R9 380
SSD: 92.4% Samsung 850 Evo 250GB
HDD: 91.8% Seagate Barracuda 7200.14 1TB

The site set the price at $726, but I already have the samsung evo 850 250GB ssd.
I'm also trying to make a computer at least decent-ish at gaming

 

[CTurbo]

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor ($174.99 @ NCIX US)
Motherboard: ASRock H97 Anniversary ATX LGA1150 Motherboard ($71.89 @ OutletPC)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($43.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($47.78 @ OutletPC)
Video Card: Gigabyte Radeon R9 290 4GB WINDFORCE Video Card ($262.98 @ Newegg)
Case: Corsair 200R ATX Mid Tower Case ($49.99 @ Micro Center)
Power Supply: EVGA 750W 80+ Bronze Certified Semi-Modular ATX Power Supply ($49.99 @ NCIX US)
Total: $701.61
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-08-21 19:17 EDT-0400

 

[Tcman2000]

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor ($174.99 @ NCIX US)
Motherboard: ASRock H97 Anniversary ATX LGA1150 Motherboard ($71.89 @ OutletPC)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory ($43.99 @ Newegg)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive ($47.78 @ OutletPC)
Video Card: Gigabyte Radeon R9 290 4GB WINDFORCE Video Card ($262.98 @ Newegg)
Case: Corsair 200R ATX Mid Tower Case ($49.99 @ Micro Center)
Power Supply: EVGA 750W 80+ Bronze Certified Semi-Modular ATX Power Supply ($49.99 @ NCIX US)
Total: $701.61
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-08-21 19:17 EDT-0400

Thank you, is there anything else I need to know, other important parts?

 

[CTurbo]

Do you have windows? You'll obviously need that and a USB drive or optical drive to install it.

 

[Tcman2000]

I have windows, my cousins going to help me with it. Do I need to buy ram?