You already have a Google account if you have an email address that uses “@gmail.com” or if you log in to any Google product (including YouTube).
If you don’t have a free Google account, it only takes a few minutes to create one. The only thing you need is a mobile phone number, as they’ll text you a code to verify the account. You can give Google as much or as little information as you want when setting up the account.
To set up your account, follow the instructions on Google’s support website.