Custom Hook and Update of WHMCS

1) We need a custom hook for a WHMCS product which we already have to stop the product after certain days. 2) We need some fixing in our CSS for our WHMCS 3) We need to upgrade version of WHMCS from 4.5 to 5 (current version). You should be wiling to communicate with us via skype, gtalk or phone after the project is awarded. You should have previous experience with PhP and WHMCS and custom module and hook programs.