However, withdrawal from caffeine is seldom dangerous, though it can make one uncomfortable for a few days. The most frequent symptom associated with this withdrawal is a moderate to severe headache. This can occur between 12 and 24 hours after last intake of caffeine.
Okay, for step one you need to get the command blocks in your inventory. Make sure you have cheats ON and say /give (player name) command_block. After you get in in your inventory place 5 in a row.
Place a command block. Check your inventory and look for the command blocks you just created. The icon is a brown, patterned box with grey control panels on each side. Move the command blocks to your quick slot and place one on the ground, just as you would any item.. Enter a command. You can enter just about any command in the command block's text field, then press Done to save it in the block. There's a long list of commands included below, but try summon Sheep for your first experiment.