Miss Fortune is a hyper carry(meaning that she'll be carrying the team) and with the right runes and masteries she has absolutely amazing damage while having decent health with good MR and Armor, she can be pretty difficult to master and of course, she has her flaws such as bad ganking, dont pick MF if there is no tanky top or if the ad carry and mid counter picks them self's, the reason why jungle mf can be used is because of fast she can take a camp.
But I'm sure that, with some practice she can be a very useful jungle.

For those who brave the harsh seas of Runeterra, attaining one's own ship and crew is the pinnacle of success. Sarah Fortune, a well-respected (some would say legendary) bounty hunter from Bilgewater, was able to achieve this feat just after her sixteenth birthday, etching out her name as the go-to gal for resolving special troubles. No bounty was too difficult or too dangerous for her feminine charm and her renowned use of her twin pistols, ''Shock and Awe''. Her success gave her the means to legitimately purchase her own ship... with a little flirtatious haggling, of course. Things weren't always so fortunate for Miss Fortune, though. When she was young, trade ships began to dot the horizon of her quiet home in the northern shores of Blue Flame Island's largest chunk. Trade routes brought piracy, and the inhabitants soon found themselves caught in a frenzy of pillage.

One day, young Sarah returned home to hear gunshots and screaming. Her front door was smashed open; inside, she saw her mother lying in a pool of blood. A sudden blow to her head made her collapse next to her slain mother. The last thing she could remember were her attacker's red eyes, as his face was blocked by a rogue's bandana. Miss Fortune has a strong distrust for pirates and she finds herself constantly bickering with the infamous Gangplank (the only captain to resist her charms) over the direction of Bilgewater politics. Her two goals: to unite the people of Bilgewater, making them into a strong and independent society, and to find the pirate who killed her mother. To that end, she has entered the League of Legends as a champion, trading her skills for the wealth and influence that will help her accomplish both.

Pros

+ Has a slowing ability for ganks (Make it Rain)
+ God like damage
+ Great Invading and clearing jungle abilities
+ Leaves room for a second ad carry on bot which in late game = win

Cons

- Pretty squishy
- Usually targeted in team fights (As all AD-carries are..)
- Needs to be positioned well
- not viable at high Elo(and will be *****ed at if picked)
- Ganks not as good as you would like them to be due to the squishyness

Quintessences: I recommend you to use pure Strength Runes as quitessences, because in the early game, you will need as much damage as possible to clear out creep and keep that counter jungling out. I recently changed my Marks to Attack speed cuz MF shoots slow as hell. Glyphs and seals will be your patch to ganking successfully without dying in one hit, i picked scaling MR as my Glyphs due to mid ap Heros, they are just as squishy and dont put out an early nuke in tell later in the game so scaling is Key, and Btw did i mention your an Ad Hyper carry, they aint got **** on you so trolololololol free kill!!!

Your going to need Smite The buffs are kinda tanky :3. Flash is to gtfo When **** hits the fan, other Viable summoner spells can be Ghost but why would you use that over Flash besides chasing down a kill dont be an idiot play passively smart gank take opportunity shots then btfo, its not about getting kills its about getting ahead with a **** load of creep so you can enter the late game with a better advantage.

your PASSIVE is Strut which gives you an additional 25 movement speed after not taking any damage for 7 seconds great for ganking

Double Up is your Q that lets Miss Fortune fire a shot at an enemy target, dealing physical damage and 115% of that damage to another enemy target behind the first. good for clearing out jungle and chassing down two people little will they know that the one in front will die.

Impure Shots is your W Miss Fortune's attack speed is increased for 6 seconds and deals more damage with each shot great for killing the buffs this allows her to take blue alone if there is no one to assist in leash.

Make it Rain is your E which is complete trash it slows down enemy's for a gank but that's the only use. Miss Fortune fires hundreds of bullets into the air which rain down at a location.

Finally the Q the killing blow to a gank Bullet Time Miss Fortune channels for 2 seconds to fire a wave of bullets in a cone in front of her every quarter of a second. This will kill anyone with low health it has a long *** range but Not to mention that whenever you position yourself PERFECTLY somebody just silences you or stuns you then you die.

You will start off at your blue for MF is mana hungry. Wolfs wraiths Golems Red, Wolfs Wraiths Golems. Back home buy second and third item then do wolfs wraiths Golems, gank then get your blue then look for openings

Yellow: Vital to protect the jungler on your team
Blue: For protection depending on which lane you're on
Red: To guard Dragon and Baron
Green: In order to Counter-Jungle

You should keep both warded with a Vision Ward. Other spots that you see on that map are all for Sight Wards and are crucial to defend your jungler and your partners in lane.