Anyone wanna give me some tips with my favorite champions?

Nocturne
and
Blitzcrank

My friend plays as Miss fortune i find it very nice to use blitzcrank while i play with him.

i pretty much just wanna know how i should build in and out of game

Nocturnes End-Game Final Build: (the one i use)
Berserker's Greeves
Infinity Edge
Bloodthirster
Phantom Dancer
Frozen Mallet
Phantom Dancer

*I usually get the IE and thirster first because I got 35% atk speed from the rune page i use when i play noct. You may want to build the IE then Phantom Dancer then Thirster.

*I buy a doran's shield first then sell it for more items later.

If you haven't already, set up smart cast on Blitzcrank. His pull is so much easier to do if you have smart cast set up.