You can make an Iron Golem in Minecraft using four iron blocks and a carved pumpkin, or find them naturally in the world.

You can make glass in Minecraft by smelting blocks of sand, and combining the glass with other items can craft even more.

You are going to need a lot of blocks for this build so you should better get to farming. As for the blocks themselves, you can pretty much use anything. Cobblestone and Wood are the most common ...