Ooph, it's been a while since I played Shadowrun Returns. Definitely possible to put a lot of playtime in. You can customize, so that kind of branching is possible. Since it's a turnbased game, you probably want to get used to it first so not sure about difficulty.
Race matters occasionally in interactions, and racial benefits matter for builds, but not too much. Lorewise, elf adepts should be fine, really.
As for decking: It's basically a separate minigame where the decker also explores and fights real-time inside the Matrix. You can use a teammate for it, if you don't want it on your own character. You're controlling a party, after all, not just yourself.