First,go always to mid or with the stealthed one of the team.

Dont place turres away from creeps or very close to them because their effectivenes would be zero.

When your turrets are lvl 3 place them next to each other for maximun efectivenes.

Its better to use the Micro Rockets when the enemy champion is alone.Do that to avoid spent the rockets on creeps.

When you throw the CONCUSSION GRENADE you have vision of the area around the grenade.Use it to see enemies in the grass.

When you made Rabadons Deathcap sell the Kages Lucky Pick.

If the enemy has a mage or a dps that can kill easily make Abyssal Scepter or Zhonyas Hourglass before Deathcap.

if a turret is low life do your ulti instead of building a new one.Costs less mana,especialy in the beginning of the match.

thats my advises.hope to help you.
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