This tutorial will explain the process of pouring and cutting a two-piece mold using platinum silicone. These dividing lines are a bit more complicated than the proper dividing lines for a standing figure. Update! When I took this photo, I used P525. I'm not sure if it's still available. If I have to reshoot, I'll use the slightly harder TC-5130F or TC-5140. Also, Eject-it 33 is no longer available, so I recommend using Zip 301.
As with all mold making, practice makes perfect. Make sure you have a plan before you begin, and test the silicone on the surface of your mold if you're working with an unfamiliar material.