when your first making a new world make the difficulty Peaceful because when you get in the world first get like 20 log and make wooden planks then make a crafting table.then you will need to make a pick axe when you do that then get 3 cobblestone for then to make a stone pick axe then when you make that try to find as much Iron and Diamond as you can when you find like 26 Iron or 26 Diamond thats when i would start fighting then you can make full iron armor or full diamond armor and also have 2 left to make a iron or diamond sword and you would be really hard to kill and thats how you be an ultimate fighter