How to register with Registrar

I have a question about how to register for Cloud Registrar.

I have a question about how to enter my personal information in Japan.

… Address 1
→Æ How far do I need to enter my address 1?
Telephone number (Smart phone)
→What if the phone number starts with 090? (I understand about the notation that the country code is +81, so it would be +8190)

Please help me if you are Japanese OR know how to write it. Please help.
Questions about the above two items.

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