What lens and flash are used for school news photography, Canon EOS400D?

It is used to take news photos and other photos of school meetings (leaders' speeches, meeting places) and activities (sports activities, cultural activities, teaching activities, military training, ceremonies and guest visits). I used to use the camera lens 18-55, but I felt that the focal length was too short to be photographed in the distance, so it was inconvenient to get close, especially at the meeting place. I'd better give suggestions and quotations. I need it for my work. I'm in the school office. Thank you. Thank you. The recommended lens must be equipped with 400 D. The machine is almost enough, but I don't think the school is very big, but it needs to take a lot of photos. The budget is expected to be 2000-4000, but it still depends on whether the leaders can approve it. I want to ask you about your experience first. The shutter of 18-55 is broken, and it can't be used now. It is urgent to fill a lens. However, the zoom of 18-55 is too short, especially for sports meetings and military training, so it is difficult to capture close-ups. I have also encountered dark indoor venues, so I need to improve the sensitivity and lock the shutter value, so I hope I can also match a flash to fill the light properly.