Setting up WHMCS and Customize it a little bit. -- 2

Hi everyone; I want to setup the WHMCS. and a little bit customization. for example, custom email after registration. an entry into the pre-build database(other than whmcs).users (table) with unique Username/Password. and email username/password to user after registration. Copy the template files(I'll provide a sample file for test purpose) into a newly created domain after every successful registration. we don't wanna provide our customers the access to the CPanel or FTP. No SQL database, no Email accounts, etc etc we don't want them to enter a different DNS Nameservers entries. since we will always be using our hosting. we'll always provide the hosting+domain (both). So, no single registration. Mostly things are customize-able using WHMCS admin panel. except unique Key generation part.. Please no Time wasters. and you need to be responsible for your task. Thank you!