How Can Get Started Programming vBulletin Hacks

[Come2Daddy]

Hello there;

Actually I have a little experiounce in php programming and I want to start production my own hacks, but I don't know how to integrate my hack or mod with my vBulletin.
Lets say for instance I want to program simple ads hack so I need to create a form in the admincp to fill it with the pictures' links of ads and the ads links(i.e., the url of the web that advertise with us.), hence we submit that form inputs with post method and since the form is in the admincp then it does not require us to go through validating input.
of course I would need a table in the database to hold that form's inputs.
and I need also a simple table to be located in one of the ads templates such as ad_header_end.

but I don't know how to creat a form in the admincp, and if I did I don't know how to extract my hack as xml file so I can distribute it or sell it?