Landing page with form wizard

This is nothing more than a single page containing a form, which when submitted sends the information via email to a predefined email address. There is no ecommerce function to the site.

Technology: Plain HTML5/css/js is fine, and Classic ASP or PHP for the emailing part.

Reference sites (though they contain an ecommerce function) :
https://www.parcel2go.com/ (main example)
https://spourgitis.gr/en/ and particularly: https://spourgitis.gr/metafora/eng/
https://demo.phpjabbers.com/index.php?demo=tbs_2&front=1&lid=1
https://www.anyvan.com (I like the stepped approach of their form)

There is no specific requirement as to how to structure the form. For example, here are some possible options:
Form being filled in in stages. Eg. one screen with From/To address, then another screen for customer details, etc
Accordion, with each section needed to be filled in before the user can proceed to the next section.
Simple form (eg. from/to and customer details), and an Advanced option/link which then makes visible all the various options.

Full details at https://docs.google.com/document/d/1JH3vzLuXODqUFTytvxaMc7H6M6WT1XB63D2WeEMSWD0/edit?usp=sharing