Get a dual channel kit (2x8 or 2x16).
16gb is plenty for gaming, 32gb if you're planning memory intensive tasks.
3600mhz is the "sweet spot" for Ryzen 3000, get 3600mhz c16 ram if you want one of the best options. Otherwise, 3200mhz c16 wont be a huge difference (maybe a couple percent) and will cost much less. Lots of 2x8gb 3200mhz c16 kits for $60-70 these days.
You can run the 3600 on any am4 board, but the x570 is the best choice if you dont wamt to worry about having to pre-flash a bios on to an older board. And many of the low-mid tier x570 boards are the same price as x470 boards anyway.
Find one that has the features you want (wifi, bluetooth, rgb headers, etc) and one that has the looks you like. They will all run the 3600 well.
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