You want a 650w psu for an RTX 3070. 550w for an RTX 3060.
https://www.newegg.com/white-fractal-design-focus-g-series-atx-mid-tower/p/N82E16811352067
Fractal Design Focus G White ATX Mid Tower Computer Case $49.99
Exhaust fan for that case.
https://www.amazon.com/Kingwin-CF-012LB-Efficient-Excellent-Ventilation/dp/B002YFP8BK/
Kingwin 120mm Case Fan $4.99
https://www.newegg.com/p/N82E16813119385
ASUS PRIME B560M-A $109.99
https://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=428310&CatId=11859
Intel Core i5-10400F $156.99
https://www.amazon.com/DEEPCOOL-GAMMAXX-400-Blue-Compatible/dp/B00JQ2YDCY/
DEEPCOOL GAMMAXX 400 CPU Air Cooler $24.99
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TEAMGROUP T-Force Vulcan Z 16GB Kit (2x8GB) DDR4 3200MHz CL16 $71.99
https://www.amazon.com/PNY-CS2130-Internal-Solid-State/dp/B0869B4Q66/
PNY CS2130 1TB M.2 PCIe NVMe Gen3 x4 Internal SSD $109.99
ASUS Prime series is expertly engineered to unleash the full potential of AMD and Intel processors. Boasting a robust power design, comprehensive cooling solutions and intelligent tuning options, Prime series motherboards provide daily users and DIY PC builders a range of performance tuning...
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www.fractal-design.com
Intel's new Core i5-10400F offers a large performance jump over the previous generation Core i5-9400F because of its six-core/twelve-thread design. In this Core i5-10400F review we also test the feasibility of overclocking through BCLK, or by relaxing the PL1 and PL2 Turbo Limits.
www.techpowerup.com