Depending on where you set. I would use your 50 1.8 lens.
Try to set between 3pt line and lane line.
I don't know what the crop is on a 7200 but it should be around a 70mm with a 50mm lens. Thats perfect for setting in that area for around the basket shots.
That lens will allow you to use a f stop of 2.8.
Sorry to say but your 70-300 just wont work like you want it too. You can use it but it will be tough on you never shooting sports before.
I shoot a lot of basketball and no matter how bright it looks in there. You'll soon learn its not bright enough.
Heres what I would do.
use the 50 mm
f 2.8
Minimum SS 640
iso 3000 - 6400
Set custom white balance
AFC
turn on rapid shooting
setup back button focus
Number one thing thats overlooked is using back button focus.
I always use back button focus.
I shoot a lot of sports and I would set my camera to shoot anything moving to these settings.
Servo mode AF-C.
39 pt dynamic area setting (I've tried the single, 9 and 21 pt. But the 39 gave me the sharpest pics.).
Also set your AE-L/AF-L button to AF-ON.
You set your AE-L/AF-L button this way to work with the AF-C.
When set up like this, you use your thumb to press and hold the AE-L/AF-L button and your index finger on the shutter(not pressed half down).
By pressing and holding the AE-L/AF-L button it will make the lens continually focus on your subject, all you have to do is push the shutter when
you want to take a picture. It's the same as holding the shutter half way down but sometimes its hard to do that for a long period of time.
This shot taken last Thursday. Used SS 640 and ISO 6400 at 2.8 on a 7000