Hey Toormai here. This is my second guide and it is for Miss Fortune. Miss Fortune was my first ranged champion and I believe I have learned some good aspects for her.

Pros:-High Damage
-Great mobility
-Ranged Champ
-Great Harassing Ability
-Great Farming ability
-More Damage per consecuitive hit
-Slowing Ability

Cons:
-If hit here passive is disabled
-Low health pool early game
-Needs damage from items to carry
-Mana problems early game

I focus on getting Impure shots first so you can auto attack and have an increased chance of last hitting. This build is focused around letting you farm early game and be Lethal late game. I get Double up when it seems needed because it is just a good harrasing tool and could be used as a last hitter on minions. Make it rain helps if you get ganked because you can do damage to them and slow them. Make sure you activate your Impure Shots in Team fights and when taking down a tower.

The two summoner spells I get are ignite and Exaust. You can use Exaust used to run away from a gank or save a teammate running away. Exaust is commonly used for chasing enemys and you should do this when you can. Ignite is used for possibly cheap kills and using it at a begining of a fight to deal for damage to your enemy to drop them if it is looking bad for you.

EARLY GAME:
Early game go bottom top or middle I have a laning partner which is especially great because you will see with miss fortune that having a partner that can stun and/or snare is AWESOME!! because if theyre stunned just pop your ulti and watch them get destroyed, they cant as easily run out of the bullets. basically whatever you'd prefer.Lane till around when you get ultimate then you can setup some ganks

MID GAME:
Gank when possible. Grab the buffs when you can aswell, both blue and red so you can slow them and do damage while keeping your mana up. Run up to the person and if they try to run exaust, Make it rain, Double up, Impure, and if you can ulti them down

LATE GAME:
This time in the game you want to finsh your build, gank, and push. Try to start a team fight when you can so that you can push easier if you win that team fight. If you win in a team fight run to baron grab that with a team mate or two while the others are pushing, after you get Baron run up finish the game.