First PC build

[xxlifeiscomplicatedxx]

Hey guys, so it’s my first time building a custom gaming pc and I did some research on certain parts for a low-medium budget. Tell me your thoughts and if I can go any lower?
Parts : gigabyte B360 D3H motherboard, 2 x DDR4 4GB ram(crucial company), Asus RX 560, and I3-8100 processor. I’ll also be getting 1 21.5” LED Monitor, 1 TB internal HDD and idk how much power supply I need( help me with that). Are those parts good?
And are they compatible ?

 

[ritvarsdavis]

A 450W PSU will be plenty. be quiet! has good 450W power supplies.