My Provisioning Module doesn't show in the list of Module

I Try to create a Provisioning Module on WHMCs. Base on WHMCS documents when I create this type of module I have to name that with alphanumeric in lower case and then put the module in the `Module->Server`. I did, but my module doesn't show up in module list when I try to create a new product/service.

WHMCS
|
|__ Modules
|
|__ Servers
|
|__mymodule
|__hooks.php
|__mymodule.php
|__templates
|__lib


And my another question is: I want to get extra information from a client when the client tries to buy my product such as DNS or IP and etc.
where should I add these fields? in the hooks? or somewhere else?

sorry for bad English :))