Here is the part list you can consider for buying
CPU AMD - Ryzen 5 2600X 3.6 GHz 6-Core Processor (You can also consider Intel I5 if your sole purpose is gaming)
CPU cooler Cooler Master - MasterLiquid ML240L RGB 66.7 CFM Liquid CPU Cooler
MotherbOard - Gigabyte - X470 AORUS ULTRA GAMING ATX AM4 Motherboard
RAM eam - Vulcan 16 GB (2 x 8 GB) DDR4-3000 Memory (You can buy RAM from anyother manufacturer, the only thing you have to
consider is RAM speed)
Video Card MSI - GeForce RTX 2070 8 GB VENTUS Video Card
PSU EVGA - 750 W 80+ Gold Certified Semi-Modular ATX Power Supply
You can choose Storage and Case as per your requirement. Also for better performance I strongly recommend you to get a SSD