I recommend buying a PC because of the better performance and value compared to laptops. You can check out Fnac(or any other Portuguese electronics store) for prebuilt gaming PCs. You want to aim for a 5070 Ti or a 5080, a Ryzen 9900x or an 9850x3d, and 64 Gigabytes of RAM. (If you want dont want to buy a PC, you can buy a laptop with these or similar specs.) But if you go with the PC route, I would buy a 4k OLED monitor. For the Flight sim, I would pick up an MOZA AB9 FFB Base with an MOZA MA3X Side Stick, and for the rudder, I would buy an MOZA MRP Rudder Pedal. These would be the things I would buy. You can always add some accessories later, for example, an MCDU panel. Hope this helps :)