Question   Is it possible to have a mini-form, that once filled out goes to a longer form, with all fields required, and auto-populates the data from the mini-form?

A. Yes, each banner you add will have the code needed to paste the banner on a site automatically generated.
The code will link to the Member Capture Page that is using the banner.

A. The HTML Form Code page allows an Member to get the html code to paste a form on some other site (like a personal website) other than their capture page.

A. There is a form builder, similar to Aweber, where you can build a form then get the code to copy/paste on your personal site.

A. No, do not use the code from the HTML Form Code page.
That code is for the Member to use on some 3rd party website.
This method is only attached to 1 specific Member.

Instead, you want to properly install the page, and then it will use any 3rd party autoresponder setup on a per an Member basis.
Have your developer view the page installation overview page to learn the page installation process.

A. You can create optin forms using HTML form creator.
You can add custom fields and copy/paste the code to your 3rd party website.