I've created a custom object called Invoices, related to Opportunities.  I've added a ton of custom fields, autonumber fields, etc.  What I need is to have a button that says 'create pdf' like how quotes work.  I would also LOVE to have templates so I can play with the pdf.  Pretty much, I need this new invoices custom object to act just like how quotes work.... 

So I don't know where to start....