This guide is going to explain how to create an ERC20 token, not ERC721 (aka NFT) See upcoming guide for NFTs
Go to https://wizard.openzeppelin.com
Create a contract, with (1.) a custom name and symbol, (2.) a premint amout (aka the amount you start with) and finally (3.) select if you want it to be mintable if you want to add more later and if you want it burnable (if you want to be able to destroy them)
Simply press the big blue button
Switch to the deploy tab
Select Injected Web3 environment
A window should popup to connect metamask
Press Next and Connect