When surveying a new world what do I need to check exists that I can't create later?
Solution 1:
Sugar cane, clay, cactus and mushrooms (both red and brown) are the rare things that I believe you will need to make a successful world. Do keep in mind, though, that your diamonds, gold, lapis lazuli, and even iron and coal supply is limited. Animals spawn randomly so don't worry if you cant see any.