The first thing of the Challenge is easy. You need to get a Gmail email account. No other email account can be used in the Challenge. That includes your regular work email account. You'll need a Gmail account later in the Challenge when you are introduced to other Google products and features.
Go to Gmail.com It's a popular, free email service with a lot of storage capabilities provided by Google. Click on create an account. Follow the instructions and you'll have a new email account in no time.
Be sure to check out the tips provided by Gmail. The address is www.gmail.com/tips