Create Rental/Reservation Web Application for my Squarespace website

I need help designing a bike rental/reservation tool for my website ([login to view URL]). The site has a fully developed front end and store through Squarespace, but I would like to be able to manage our bike rentals through the site as well. The web app would enable customers visiting our site to reserve a bike for a certain amount of time and then pay for the rental through our store. Upon going to the bike rental page, the customer should be able to: -View Information about our rentals, a picture of the standard bike should be displayed on this page. -Select number of bikes they would like to rent -Enter height information in feet and inches or centimeters for the person(s) who will be renting the bikes. Height information should sort available bikes that match their particular height. -Select date for the rental -Select number of days they would like to rent the bike -View cost of rental based upon how many days they are renting a bike (the cost of the rental should change dynamically based on the number of days selected) -Select option for delivery at an additional cost. If selected, they should be prompted to enter delivery address details in a form. -Book the bike through the webapp and then pay for the reservation through Stripe. -Receive email with information on picking up their bike or getting it delivered. In an admin user interface, the site administrator should be able to: -Change information on main bike rental page, including picture of standard bike rental. -Add/Remove available bikes to inventory. -Edit height sorting criteria for bikes. -Change pricing scale for rentals. -Change pricing for delivery. Ideally, the customer facing rental app should be optimized for mobile use.