i have a £600 budget for a gaming pc and need help !!!!

you can start from here
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PCPartPicker part list / Price breakdown by merchant / Benchmarks

CPU: Intel Core i5-4440 3.1GHz Quad-Core Processor (£127.19 @ Aria PC)
Motherboard: MSI B85M-G43 Micro ATX LGA1150 Motherboard (£49.99 @ Amazon UK)
Memory: G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-2133 Memory (£55.83 @ Ebuyer)
Storage: Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive (£35.99 @ Aria PC)
Video Card: Gigabyte GeForce GTX 760 2GB Video Card (£191.98 @ Amazon UK)
Case: Cooler Master K380 ATX Mid Tower Case (£37.51 @ Amazon UK)
Power Supply: XFX 550W 80+ Bronze Certified ATX Power Supply (£44.98 @ Amazon UK)
Optical Drive: Samsung SH-224DB/BEBE DVD/CD Writer (£11.72 @ CCL Computers)
Total: £555.19
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2014-04-01 07:17 BST+0100)