How can I take the motion photos like this where the background is blurred and the main subject is focused? What kind of settings I should try? I have 24-105mm lens on canon 6D.
I'll post a few examples and maybe you can get the settings from the EXIF. You'll find that the more background blur you get, the more blur you'll also get in your main subject, so I try to keep the blur down to just enough to give the sense of speed. Personal choice, really. If you have no blur at all, these pictures can look very static.
I find that the AF focussing points act quite well as a guide for panning. I use back button focussing, preselect a focus point so that with the desired composition it is on the part of the main subject that you want in sharp focus. Then the shot goes like this, acquire the moving subject, establish pan to keep focus point on right part of the subject, hit the focus button, hit the shutter fire off a short burst, just two or three frames. High frame rates are somewhat over-rated for this kind of shot.
It takes practice to get the sequence right. The shutter speed depends on all sorts of things, subject speed, subject distance to background distance, lens angle of view. Best to experiment. And if you're using VR, remember to switch it to 'sport' mode, otherwise it will try to depan the pan.
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Tinkety tonk old fruit, & down with the Nazis!
Bob