mdjobair.6500 :
mobo- ab350 pro4 or fatality k4
cpu- 2200g
ram- hyperX fury 2400mhz 4gb
ssd- su650 120gb
hdd- toshiba dt01aca100 1tb
psu- mwe 450
I recommend getting a B450 Motherboard because the B350 requires a BIOS update to enable compatibility with Ryzen's 2nd Gen 2xxx processors and without an older AMD CPU you wouldn't be able to boot your computer to update the BIOS. AMD stated they will send you boot kit to update the B350 boards but it's a kind of a hassle since you need to contact their customer service to file a warranty claim to receive the kit.
You should get at least 8gb RAM minimum preferably around 3000 MHz