Word Press website needs some changes

We have a wordpress website that we need some help with, the design is almost complete but we need help with a booking form and then we will need to link the website to a payment system (Sumup).

The booking site needs drop downs added (height, weight, ability etc) along with the number of users increased from the current 1 to 10 people.

You can see where we are with the website here: https://mohammadsohaib.com/hire-prices/

I'm looking to get this fixed as soon as possible