Yea, if people flame you just ignore them (Press tab and press the little bubble on the far right side of their name).
Other than that it's more important to farm cs (creepscore/minions) than to get kills.
Play safe. Don't do risky stuff if you're not 90% sure you'll survive it. Don't towerdive at early levels.
The meta now is 1 bruiser top (tanky top) or assassin top (squishy damage dealer with high amount of damage), 1 jungler to gank lanes, 2 bot (1 attack damage carry who is super squishy but deal tons of damage and a support who just help the ad carry stay alive and get kills and ward the lane) and 1 ability power or attack damage bursty champion mid.
I encourage buying wards no matter what role you play, unless you're ad carry then it's understandable as you got a support for that (most of the time at least).