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 ...
Here, you can check out the best automatic Minecraft farms to add to your world.
To make a mob farm in Minecraft, you'll need stone, trapdoors, chests, hoppers, slabs, and water. Your mob farm will automatically spawn enemies and collect them into ...