Before deploying the custom token you first need to:
MetaMask is an in-browser Ethereum wallet. It allows you to send Ethereum transcations and is necessary for starting to use Ethereum.
To install MetaMask:
Visit the MetaMask website.
Follow the instructions to add MetaMask as a browser extension.
Restart your browser. You should now see the MetaMask icon in the top right corner of your browser.
With the newly installed MetaMask extension click the icon in your browser. This will open up MetaMask with a setup guide for creating a new account (wallet).
After following the instuctions you should see a screen with information about your newly created Ethereum account.