Need help building my very first PC :)

Considering that you'll be building quite far down the road, I'd say post again for help about 2-3 weeks before your intended build time. Prices fluctuate quite frequently in the PC world, so any build posted now won't be as relevant.

However, this build should give you a ballpark about what to expect performance wise.

PCPartPicker part list / Price breakdown by merchant

Type Item Price
CPU Intel Core i3-4150 3.5GHz Dual-Core Processor $104.95 @ SuperBiiz
Motherboard ASRock H97M Anniversary Micro ATX LGA1150 Motherboard $60.98 @ Newegg
Memory *Team Elite 8GB (1 x 8GB) DDR3-1600 Memory $49.99 @ Newegg
Storage *Western Digital RE3 1TB 3.5" 7200RPM Internal Hard Drive $44.25 @ Amazon
Video Card Sapphire Radeon R9 280 3GB Dual-X Video Card $164.99 @ Newegg
Case Cooler Master N200 MicroATX Mid Tower Case $39.99 @ NCIX US
Power Supply Corsair CX 500W 80+ Bronze Certified Semi-Modular ATX Power Supply $39.99 @ Newegg
Prices include shipping, taxes, rebates, and discounts
Total (before mail-in rebates) $545.14
Mail-in rebates -$40.00
Total $505.14
*Lowest price parts chosen from parametric criteria
Generated by PCPartPicker 2015-04-02 15:11 EDT-0400

An SSD is pretty low on a $500 gaming PC's priorities, so I couldn't include it without a significant sacrifice for your in-game performance. For 1080p gaming, the 280 should perform respectfully and is more than enough performance for League and CS:GO.

/r/buildapcforme Thread