Here’s what I’d do:
- Use the telephoto lens exclusively
- Set the camera to Tv mode, and set it to something between 1/500 and 1/1000 of a second
- Activate auto ISO, but go into the settings and set a max auto ISO of 1600
- Only shoot at the max zoom when absolutely necessary (remember, you can crop later)
Last summer I snapped a few dozen pics of a pick-up ball game the broke out at a family BBQ using my old T3 fitted with the 55-250 lens. I used this general approach and the results were sharp and well exposed.
Note, my intent was to freeze motion; if you want “motion blur” to imply speed and whatnot, slow down the shutter. I don’t like doing that personally, because to my eye, it more often than not makes the photo look botched.
These settings should pretty much work in a set-it-and-forget-it way. Some might disagree on my ISO advice, but I’d argue that it’s the best option for the gear you’re using. The quality is still acceptable in daylight conditions and the auto ISO gives the camera a bit more latitude in getting a good exposure using its internal smarts, thus freeing you up to take more shots. Remember: every second you spend farting around with your settings is a second you cannot be capturing memorable pictures.