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 ...

Discover a complete xp farming guide covering the best xp methods and simple "Minecraft" xp farm designs that work reliably across Java and Bedrock versions. Pixabay, allinonemovie Experience points ...

Between all the building and mining, Minecraft gives you a lot of freedom to wander around and discover all sorts of mobs. Some are passive, some will try to attack you, and some can even be tamed.