I play Normal (Draft) to work on my fundamentals (last hitting, champion mechanics, laning phase). I play ARAM to tune my team-fighting skills (positioning, etc...) of course ARAM will only help so much since it isn't Summoner's Rift, but it is still useful (in my opinion). After I feel comfortable enough with a champion I will try them in ranked.
I have gotten use to ignoring the salty players. If their chat gets offensive enough I will mute/report. Just don't let people goad you into getting yourself in trouble. No one in the league community is worth getting worked up and frustrated. Remember to have fun and that bad games will happen but so will good ones. Gotta take it all in stride.
[slayer-jinx-catface]