Use pcpartpicker.com, you should be Able to fit a ryzen 5 3600, Windows 10 home, an rtx 2070, 16 gb 2x4 3600mhz ram, A 2tb hdd, And a 256gb ssd into that budget. Other parts like case and monitors you should do some research on and look at reviews. Building a pc yourself usually is cheaper, watch some videos on how to build a pc once you’ve gotten all parts and then install windows.