WWfF,
Good lens choice.
My opinion based on shoot similar in high school on the yearbook staff.
I was OLD school, and shot film, and manual everything.
In most gyms, the lighting is even and stable. So once you get a proper meter reading, that's it. I just set my camera at that setting, and left it alone. Then you know what setting you are shooting at, and the camera is not fooled by the background, as you move around. The only exception is a day shoot, if the side blinds are opened, then you would get extra sunlight coming in from that side which would affect exposure. I honestly don't know how well matrix metering will work, but it is worth testing it out yourself. I used to take an incident reading.
Yes I think CL and C would work.
I have trouble with burst mode, too many years of single frame shooting, and ME selecting when to shoot. I do recognize the value of it, just have to get my head to use it. For me, a motor drive adds extra weight and bulk that I would rather do without. Weight is one of the casualties of getting older. Also film cost $ for every shot, vs. digital where extra shots are 'free.'
I would use center point AF, and make sure that your subject is on the AF point. Or set and hold focus, then recompose, then shoot. I found dynamic AF tricky to use. Will the AF select the correct AF point for the subject, or will it focus on something else (the ref in front, or the crowd in the background)? I want to be in control of where the camera is focusing.
gud luk