Quick Heads Up...
A Junglers lane is the Jungle. Their farm is the neutral monsters. That is not your farm, however taking it in the mid-late game is generally acceptable. Mid laners taking raptors/asking for blue is also acceptable.
Junglers are not required to gank your lane any more than mid is (hint, they're not required to at all...) By ganking they're lending their time to help get themselves and you ahead. This is not a requirement for the role.
Junglers likely won't gank a lane that is obviously lost, however they might gank a lane that is behind. If you are so far ahead to the point where the enemy turret is constantly being pushed, you won't get ganks either.
Junglers can't gank lanes when they are pushed. If you need a gank, freeze the lane under your turret.
Junglers will prioritize their own objectives (Dragon/Rift/Baron) over yours, however, if they gank bot/top then say "Let's get Rift/Dragon" you go help them with that. They ganked your lane so that you were free to help with that objective that benefits the entire team.
Junglers gank because they see an opportunity to get you ahead. Getting you ahead isn't just a couple kills/assists. Shove to the turret, if you can take it, do. If you can help the jungler safely invade and take a camp, do it. If you can take dragon/rift, do it. If you have the hp/mana to roam mid for a 4-man gank/push and that's what's being called, do it. There's more to ganking than just getting kills/assists, forcing the enemy to back is often more than enough to get you ahead.
Supports should farm creeps when their adc is out of lane, however they should not push the lane unless it's to the turret to deny the enemy adc farm (and it won't hurt their adc to do so)
Supports are allowed to get kills every once in a while. it doesn't hurt, the enemy still died, it's still a gold advantage for both people.
Supports are the primary damage dealers of the early game. They have high base damages and low ratios. Do not be surprised if a support takes a kill, do not flame when a support takes a kill. I guarantee, unless they're playing Annie/LeBlanc/etc. support, they did not mean to take it.
Supports are not the property of the adc. Supports are not the property of the mid laner. Supports are not anyone's property.
Supports should pick what they're comfortable with both into the enemy team, with your team, and with themselves. If you needed a tank, maybe you should have played one. Don't blame supports for not picking tanks.
You're allowed to gently nudge a support in a direction, however being commanding is not okay. They're your teammate, they're a person, and they have feelings. They are allowed to do what they want just as much as you. This goes for every role, but I see it most often with Jungle/Support. "Pick a tank jungle/support!!" picks a squish support/jungler "God damn it ff @ 20"
The game is not over at first blood. The game is not over because the enemy took baron. League of throws! Most of the boards is in SILVER or BRONZE. In Silver, games are NEVER completely lost. There have been games where my team was over 20 kills and 10k gold behind and we manage to stall it out to the point where we were on equal footing. The enemy WILL play a LOT more openly and stupidly when they have a lead. Abuse this, take the lead back.
The surrender button is your WORST ENEMY. Don't use it. Hit NO every time it pops up. Someone flames you for hitting no? Mute.
The mute button is your BEST FRIEND. If your ally ends up being toxic, mute them. Don't unmute them, they can still ping. The last thing you need is to read their verbal abuse and get tilted yourself.
DISABLE ALL CHAT IN RANKED. I LOVE all chat in norms, don't get me wrong, it can be HILARIOUS. In ranked, however, the ONLY purpose for all chat is to tilt the enemy. Disable it and save yourself a headache and even a few games.
League of Legends is a GAME. The ENTIRE purpose of games is to have fun. You stressing so much about ranked takes away a significant portion of the fun. NONE of you are going to be the next doublelift. Akali is SO HOT, our resident plat/diamond assassin main, isn't going to be LCS. If you aren't having fun, DON'T PLAY. If you're stressed or angry and you insist on playing, NORMS. If you stress easily, don't play ranked at all. If ranked is stressful for you, you aren't playing it properly. I get it, it's supposed to be competitive, and it is! But if you aren't having fun, if you're getting angry/stressed, it ISN'T WORTH IT.
(Side note, Akali is SO HOT, that was a challenge. Get into the LCS then prove me wrong, I dare ya.)