This is the best team you'll ever see.
Tryndamere top,
Heimerdinger mid,
Ashe adc,
Soraka support and
Master Yi jungle.

This team is full of easy and cheap (except for Heimerdinger) champions.

All you have to do once you're level 6 and want to go kill someone that you may have had trouble with, Press E and target them, Press W if they start running away, If not, Press R and then Q and hit them. If they aren't dead, just keep using E then Q and W if they run away (Don't forget to spam basic attack!)

Place down 3 turrets iwth QQ to protect yourself, then when an enemy comes, Press R, Then W, Then E. That should get you a kill, if not, ignite them and then basic attack them.

Just use W, then Q and then (if avalible) R. Then after that, Keep basic attacking and they should die.

What you do with Ashe is use your Q, Then E, and heal Ashe with W. Just repeat that, But if you and ashe are both on low health, Use your R.

Go into the river and hide in the bush to gank mid. When an enemy comes near, Use your Q, Then E, then (if avalible) R and just repeat that. If you're on low health after the fight, Use your W.

This should help you and your friends play a good round of LoL.
I hope this helped, If it didn't, I'm sorry.
(I am a level 15, after all.)