Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
Early on, you should place your turrets in locations to most efficiently kill the minions in your lane, while placing it in a place to protect yourself from enemy players. Your Rocket skill is your main damage dealer use it on other enemy summoners at every chance, just keep in mind that it shoots the closest 3 targets, which means you need to clear the minions around your intended target before firing.
Mid game you should focus on farming and helping your team when its needed, you will benefit your team most if you can complete your build and reach 14+ quickly.
Late game, stick with your team or lead attacks, use your turrets to guard your flanks, set up ambushes. Placement of these turrets is very important. You can also use turrets to help you escape or add more damage output (this is if your turrets are no where near you). Have fun, and your extra hp should keep you alive enough to be a real pain in the rear.
Your main damage will be from Rockets>Grenades/Turrets>normal attacks. Before a fight, i will useally place 2-3 turrets where i think the enemy will either flank me or chase through. Then charge the enemy using Grenades for the long range attack, and using Rockets when ever a chance is available. While skills are on CD I either run or use normal attacks, it depends on the current situation. Follow this general order and you should fair well in battle against other summoners.
Item Build Order:
The complete build costs 14650gold, its possible to complete just not every game.
1) At the start of the game buy a Sapphire Crystal(400gp) and 2 health potions(45gpEach). This will give you your much needed mana for your skills and enough health to not have to leave your lane till your ready.
2) Once you have 925gp return to your base and by a Catalyst the Protector, this will give you additional health and will restore mana and health each time you level which will help keep you in your lane.
2.5)Buy regular boots for 350gp either at step2 or step 3. After this point you can build a Chalice of Harmony if you need the faster mana regen, which you will need eventually.
3)Now save up 1710gp and return to base once again, complete your Rod of Ages. Now would be a good time to upgrade your boots to Mercury's Treads which will cost you 850gp, you can build these when ever you want, but keep in mind that these will save your *** alot and just keep you in team fights longer.
4)Get 980gp and go build a Tear of the Goddess, this will give you additional health and mana which you both need for science.
5)At this point you can build the rest of the items in which ever order you would like:
A- Rylai's Crystal Scepter, get this if you need more health and mana, and if you need to slow your enemies.
B-Zhonya's Ring, this gives 120ap which is very good for your killing power, it also increases your ability power by 25% which will give you even more killing potential.
C-Complete the Archangel's Staff, this will give you more base ap, with a nice bonus of 2.5% of your mana into additional ap.
(D)If your enemies are piling on magic resist, replace one of your items with a Void Staff, it adds 70base ap and 40% magic penetration.