Okay, here is a build. If you have to buy the components one at a time what I would do is buy the components in the initial build first, it will run as a complete system. The integrated graphics from the i5 will allow you some low level gaming until such time as you can buy the video card.
You could possibly buy the SSD first and buy the HDD as an upgrade. Moving programs and OS from the HDD to the SSD can be a hassle.
If you don't care about waiting for the system until you have the video card then I would switch the CPU to a Ryzen 5 1600 and the mobo to a B350 like one of these. I believe that you will get a slightly better system in this price range with this CPU/mobo combination but the 1600 has no integrated graphics so you have to get a discrete card before it will work.
https://pcpartpicker.com/products/compare/2pnG3C,Y4kwrH,HQvZxr,CczZxr/
Initial Build
PCPartPicker part list:
https://pcpartpicker.com/list/KKT9kT
Price breakdown by merchant: https://pcpartpicker.com/list/KKT9kT/by_merchant/
CPU: Intel - Core i5-7500 3.4GHz Quad-Core Processor ($184.89 @ OutletPC)
Motherboard: MSI - B250M MORTAR Micro ATX LGA1151 Motherboard ($85.99 @ SuperBiiz)
Memory: Corsair - Vengeance LPX 8GB (2 x 4GB) DDR4-2666 Memory ($76.63 @ Amazon)
Storage: Seagate - BarraCuda 1TB 3.5" 7200RPM Internal Hard Drive ($44.78 @ OutletPC)
Case: Zalman - Z11 NEO ATX Mid Tower Case ($45.49 @ Newegg)
Power Supply: SeaSonic - S12II 620W 80+ Bronze Certified ATX Power Supply ($48.99 @ SuperBiiz)
Operating System: Microsoft - Windows 10 Home Full - USB 32/64-bit ($102.99 @ SuperBiiz)
Total: $589.76
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-09-27 14:41 EDT-0400
Upgrade parts
PCPartPicker part list:
https://pcpartpicker.com/list/yqnJcc
Price breakdown by merchant: https://pcpartpicker.com/list/yqnJcc/by_merchant/
Memory: Corsair - Vengeance LPX 8GB (2 x 4GB) DDR4-2666 Memory ($76.63 @ Amazon)
Storage: Crucial - MX300 275GB 2.5" Solid State Drive ($92.99 @ Amazon)
Video Card: EVGA - GeForce GTX 1060 6GB 6GB SC GAMING Video Card ($269.89 @ B&H)
Total: $439.51
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-09-27 14:43 EDT-0400
Ryzen Components
PCPartPicker part list:
https://pcpartpicker.com/list/QZGcvV
Price breakdown by merchant: https://pcpartpicker.com/list/QZGcvV/by_merchant/
CPU: AMD - Ryzen 5 1600 3.2GHz 6-Core Processor ($195.89 @ OutletPC)
Motherboard: MSI - B350 PC MATE ATX AM4 Motherboard ($89.99 @ Amazon)
Total: $285.88
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-09-27 14:51 EDT-0400
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