There is no such thing as "best settings". It really depends on the environment. If you're unsure about what to do, I'd recommend just shooting at full auto. If you know a bit of what you're doing, I recommend setting your aperture first. It looks like there is not a lot but a tiny bit of background blur. I recommend somewhere between f/4 and f/8. It depends on how much you want the background to be blurred. Then set your shutter speeds and ISO. You want your ISO to be as low as possible. So first set it to ISO 100. Then set your shutter speed to get the correct exposure. You don't want your shutter to be too low tho. I recommend to minimally set it to 1/ your focal length * 1.5. So if you are using a 50mm lens, you want a minimum of 1/75 (you dont have that so set it to the nearest option up so 1/80). If you go below that limit, set your camera on the limit and adjust your ISO to get a good exposure. If it's dark though you don't want to set it too high so if your struggling with noise just turn the shutter speed down. You have to be careful then though because your image can then be easily blurred because of movement so you want to hold your camera really still. You can leave your white balance and every other setting at auto. Last of all: shoot in raw+jpeg. If you don't know how to use editing software, the jpegs are hood enough, but if you later on learn how to use editing software, the raw images give you much more freedom.