Once upon a time, there was a..... OK! I'm not really good at introductions so i keep it simple. This is my first build that i ever made and was actually made for a friend of mine so he could try out Miss Fortune.

Currently on v0.2
v0.2 - Remade build sequence & added more details to the guide.
v0.1 - Launch of the guide.(Not finished yet)

Upcoming versions
v1.0 - Making it into a detailed guide covering everything.

Pros & Cons of being MF

Pros

Can solo really well
Amazing last hitter
High amount of movement speed
Super high auto-attack damage
Really strong AoE

Cons

Mainly focused on
Lose most of the movement speed if hit
Might have mana issues depending on the player
Bullet Time can kill you =/

When to go another Doran's Blade
The only time you really should go for another Doran's Blade is when you are being focused on. MF is really squishy and the second Doran's Blade should be either before or after B. F. Sword.
I recommend that you buy another right away if it a preamde/ranked. Surviving in a gank is more important than dishing out damage. You won't be able to do any damage if you die right? It should be bought right after boots.

Last Whisper Vs Madred's Bloodrazor Vs Black Cleaver
The only time when you want to pick Black Cleaver instead of Last Whisper is when they are a full squishy team. Madred's Bloodrazor can be a little tricky. I never felt that the magic damage in percent really helps. In a gank you will fling out your ulti and rarely auto attack. The time the gank has ended, mostly those that are tankish are the last standing one making Last Whisper your favorable item to finish them off.
Conclusion: I'ts not worth getting any of them since there will rarely be a team of only squishies on a ranked game.

Sight Ward - Grabbing your team a win
You might be wondering why im even mentioning ward. When i made this build, i was making it so it would fit in ranked games. I mostly play premades all the time and map awareness is really important. Grabbing atleast 1 ward everytime you return to your base is a wise choice. Hopefully your team thinks the same and does so too. This should really only be done with premades because solo warding can be costly after some time.