Okay, so I'm going with these because he is scaled off of AP but feel up to play with them a little bit. Find what works for YOU. It's okay don't worry you don't need to copy it down EXACTLY.

This build is going to be a basic guide to mordekaiser. Please feel free to comment and vote this up. :D

Reason for flash is so that way in early game you can get out in case they have a jungle and try ganking you, But you can use exhaust as a replacement if you like it more ^.^

The reason for Teleport is so that if your lane is getting pushed you can quickly get back to your lane.

I perfectly laid this out in the way you can buy them so you don't need to worry about buying the items that go into it, enjoy the build