single page, multi stage check out process

Currently needing a checkout/order page for business formation company. This is a really good example of what is desired as many of the options would be similar.. https://www.northwestregisteredagent.com/incorporation-service-signup .

https://secure.abclegal.com/abc/customer/order/service

Requirements:
Order summary on each step similar to exampls,
Multi Step up to 7 stages,
Options that change total price,