Build a backend WP for my Service business

Hi. I have a security and speed business that help other Wordpress websites running there pages. I will have some help to make a backend system where they can make there own users. [login to view URL] - In this link there have to choose there plan for subscription. If they choose the small plan they come to this site ([login to view URL]) After filling out the form they go to a Thanks You page, and i have to send them an invoice to complete the subscription. I want following to happend. - They fill out the form with information and credit Card information. - THe system automatic make them a user where they can login - After login in they come to there own private page. Here they get following menu bar: - See my Profile (List alle the information, Name, adress, phone, mail, VAT number and so on) - Edit my profile (Here can they edit the profile) - Add website (Here they can add the website. When they add a new website, they have to choose a plan and then pay, Membership only cover one website. There can they also choose there website, and edit the plan) The payment should be throug stripe, and shoud automatic charge the money every month