This primer is a bit old (2063 in game time, so about 14 years old), but still gives a decent feeling for the world (just ignore the part about so many hovercraft being used, that didn't really stick).
https://s3.amazonaws.com/ch_shadowrun/shadowrun_primer.pdfThere isn't a lot of stuff that mixes cyberpunk with magic, (except for the various ShadowRun novels and short story collections). So most of what you can find are either cyberpunk, or 'urban fantasy' set in roughly our current world. Both can be good for inspiration, but in both cases there are probably more books than there are movies or TV shows.
As far as movies, everything mentioned so far, and while I hate to admit it, I think one of the easiest ways to get into the right mindset to view the world is is Schwarzenegger's The Running Man (just replace 'steroids' with 'muscle replacement').
In terms of cyberpunk novels, if you feel so inspired, I agree with the William Gibson, but I’d also suggest
- Walter Jon William’s novel Hard Wired (the origin of the vehicle rigger, possibly, and it also anticipates some of the things happening in the matrix in current SR)
- George Alec Effinger’s novel Gravity Fails (it will give you a different view on all the ways to technologically and chemically boost and alter your mind in SR). (this one especially, although Hardwired too, has a very different feel than Gibson’s novels, to give you different reference points for how you want your world to feel.
- Not even remotely cyberpunk, but John Scalzi’s novel Old Man’s War gives a decent idea of what it may be like to get heavily cybered (although in that novel it is a whole new body, but the concepts are translatable)
And of course, every game world is going to be a bit different, so it is less critical to get it ‘right’ than to find a feel and focus that works well for you.