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code to create vf page using standard controller with extension
code to create VF page with StandardController Account and insert the record into Account object using Extention
If you want to use the page you are creating as the default, go into Buttons Links and Actions on the object and override the New with your page.
https://developer.salesforce.com/docs/atlas.en-us.pages.meta/pages/pages_quick_start_tabs.htm