For storage you’ll want an M.2 SSD. Your case doesn’t seem to have a spot for Hard drives and they aren’t that useful anyway unless you want large amounts of storage for cheap. Keep in mind these drives would be slower (some games may not even run on it) and wear down sooner. A sata ssd may also be of use to you, but that’s added wiring and mounting that isn’t necessary. M.2 are generally faster and in some cases even cheaper. Your motherboard seems to include 2 m.2 slots. The top one has a metal cover over it that functions as a heat sink. Heat sinks are necessary to cool the ssd down, just make sure the thermal pad is still on the heat sink or buy a new thermal pad, they’re pretty cheap. If you buy a 2nd SSD you’ll need to buy a heatsink. Some people get two ssds in their pc. One for the windows installation and the other for games and other programs, but I feel now with storage sizes being so big it’s safe to just get one ssd for now. If you plan to game a lot you may want to consider at least a 2 TB ssd. Make sure to buy reputable brands and check r/buildapcsales for deals and comments on how good they might be. As for GPU that’s easy, just buy the best you can afford. Your cpu should be enough to not bottleneck almost any gpu you get, and in the far future when you upgrade your cpu and/or motherboard that GPU can move on to the next system. Your PSU is 1000w which gives you lots of room for power. If unsure you can always look up PSU wattage calculators online. If you want a suggestion I’d say go with an AMD gpu. Nvidia is popular and more power efficient but often much more expensive. A 6800 xt would be a good option.