You need to understand the field of view of your lens, and calibrate your brain for that field of view!! Then set the camera up to zone focus, ie work out what target object size you want in your field of view, set the focus to that distance (usually manually) - AF is difficult in this type of photography as your target is invariably moving!!. Then set a fast enough shutter speed that you can stop a blurred image if you are stationery.
I usually set up something like 1/125-1/250 shutter speed F4-F5.6 aperture, Auto-ISO
As you improve you can open up the aperture more.
Initially though you need to experiment to determine settings that are good for you.