You cannot guess any Gmail address. The addresses of gmail belong to the owner. They are like the lock on the account.
You have to delete all others manually. They cannot be deleted automatically by Gmail. Then you need to create the new Gmail address.
You can change your Gmail address after you change your IP. You however do not need to do that. It is because gmail is independent of IP address.
You can use filter in Gmail: [http://support.google.com/mail/bin/answer.py?hl=en&answer=6579]
You can transfer your email address to your Gmail address book. Gmail can import various contacts from others. This can be done in the settings and then import.
You cannot get the gmail address of anyone by their name. The gmail addresses are unique for everyone. The serve the purpose of logging into the account.
The address book is like a contract book in gmail. It can be used to store contacts in gmail. It is above the compose mail where Gmail is written and is a drop down.
You can go back if you opened Gmail earlier. You can type in the URL in the address bar. You can also type in the IP address for the Gmail.
Gmail has it's own address as Gmaildotcom. It cannot be changed to any other address. It changes when one logs into his/her account.
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You can obtain a Gmail address from a Google Plus ID, by following the accompanying link.
The Gmail address cannot be changed later on. The address is a permanent one and cannot be changed. It is the unique ID that is provided to you.
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