Re: Rookie GM starting Shadowrun: oneshots and other advice, please
Food Fight and On the Run are both classics.
There's the official missions too (many of them free), which I recommend. The Grab in particular appeals to me.
The Matrix rules are... difficult to use without slowing things down and you'll find several rewrites of those rules that makes it so that it slows things down less.
Apart from that: AIs should not be playable using the official rules (they're broken in more ways than on) and Uncouth is a death sentence for every character who takes it.