Hm, I could play with you right now if you quickly made an EU W account.
When it comes to wards, wards are a must, vision of your baron, dragon, river and buffs can help prevent ganks and when it comes to counter jungling, help out your jungler counter jungle or even gank the enemy jungler in their own jungle.
Split pushing, having at least one split push champion on your team helps put the pressure on the enemy greatly. If you don't know what split pushing is, it is when top and bottom lane are pushed up to the enemy tower enabling the minions to damage the tower. You normally want to do this when the enemy team decides to fight mid, then they have the choice, move back to stop their towers from getting destoyed/take damage or continue to fight. Hesitant/Non communicating teams tend to fall to this tactic very easily.
Hm, another thing is laning, obviously you'll know about last hitting, but take care not to over extend especially during the early game. If you do choose to over extend (you might do this if you want to push your wave to the enemy tower so you can go back to base whilst making the enemy lose out on farm and xp) make sure you have a ward in the river bush.
I hope I helped, but I'm not the best player.. So advice from the others here would be much more helpful :')