https://youtu.be/J1SnyYxbNFA this guy make a pc with most of the same components and its a 300$ build, but in his build he uses the ryzen 3 3200 and it has inter grated graphics, so if you use that until you got cash to upgrade and get a 1030 or 1050 or smth. He make a good build for 300. Heres a case that 50$ thats mini itx, and the mb is mini itx https://www.amazon.com/darkFlash-MicroATX-Computer-Magnetic-Tempered/dp/B07R6K6VGC/ref=mp_s_a_1_6?dchild=1&keywords=gaming+pc+case+with+psu&qid=1606224975&sr=8-6 these are case fans there not rgb, but theres some cheap rgb pack of fans for cheap, and normal case fans that are cheaper. And some other cases come with fans.