How to add opportunity with existing account on visualforce page?

However it should not be a related list on visualforce page just a add button then fill all the required fields.
click on save.
Opportunity should display on visualforce page with existing account.

I was wondering if anyone can help me to create a sunburst chart in salesforce.

How to create a multi select picklist on visualforce page and I want 10 values in that picklist. If I select 5 values then selected values should come in a different picklist on different visualforce page. How to do that?