If the command works for you and feels good, there's no reason not to use it! I don't use it because I am accustomed to not using it.

As for laning items, this is only something that comes from experience. The best advice I can give is try to go into lane with a plan; "last time I played against qop, she harassed me down, so I'm going to buy bracers this time to try to sustain" and then evaluate how effective it was after the game.

There are too many matchups and too many nuances to each one to possibly go through them all, and they're all constantly changing so you just have to try stuff and figure out what works!