I really liked this guide, pretty new player myself (first week). I took quite a few things from this guide, but one thing I wanted to say is that people are still *******s if you aren't doing good your first time with a character even in practice games. People who drop from practice games just because someones picks a champ they don't like piss me off. If you're so intent on winning, why don't you play a freaking MM game, where people are actually more competitive and it actually means something on your record when you win? Some people play practice games to, you know, actually ****ing practice and learn the game, not everyone is pro from day one like you.
Also, learn when to surrender. If the other team has taken a couple of inhibitors, ace your team as soon as you take 10 steps off the respawn area, suicide for lulz, and pretty much just use /dance outside your base, it's probably time to surrender and do something more productive than running your squishy self into a big fat Gragas buttstomp.