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We have two identical sites and we need the changes for both.
1) Update our current version to the newest version of WHMCS without causing issues with our customized design of WHMCS.
2) We need the clients to sign up for our services through a single page rather multiple page. So choosing products, capturing information and running our module should be done in one page. We use a module to create a specific product (not domain or hosting) so your single page should be able to run our module.
3) Setting up a free trial add-on so the clients get charged after a certain amount of time. There is currently some add-ons available but you should be able to implement that into the new site.