如何轉google ac的名？

I would like to change the email address of my gmail /google account. How can this be done? Since I'm receiving many junk mails and I want a 'cleaner' account, I hope I can get a new address, is this possible? If this cannot be done, can I open a new google account, and transfer all information (contacts, calendar, drive, mobile apps, etc) from the old one to the new one? How can I do this?

thanks