runes are simple, its like all ad carry runes
9 armor pen marks
9 armor seals
9 MR per level glyph
3 attack damage quintessence (more armor pen would work too)

going 23-7-0 is for mysteries my favorite, but if you are having trouble with using your mana early game, go 21-0-9.

Mf is one of the few champs that doesn't need shoes level 1. Her passive gives enough speed for dodging skill shots. Doran's blade first item gives easier last hitting, more hp, as well as a total of 6% life steal level 1. first time back grab your attack speed shoes and a second doran's blade. 2 doran's blade early game can give you a lot of damage early game. Rush infinity edge next for the critical and huge early-mid game damage. Grab some life steal before going out as it can keep you alive in team fights and give sustainability in lane. You could buy this instead of a 2nd doran's blade before the infinity edge. From this point on, you build can change quite a bit, but in the end you want to have 1 infinity edge, 2 phantom dancers, 1 bloodthirster, gardian angle, and shoes or tri-force. Aim for 100% crit.