My new pc hp prodesk 600 g4 Mt

I got a PC HP prodesk 600 g4 Mt for 24k from olx it has 8 gb DDR 4 ram with i3 8 gen 4 ram slots 250 v psu I want an advice I want to do light gaming so which gpu is good and is this worth it or not ? For this price btw it has no hdd but has an nvme slot and I am currently using my laptop hdd .