I'm creating a student registration module. I'm very new to Openobject and still in the design phase so I'd appreciate it if you can help me do this right.

The registration module should take the following information from the user:

Student Name (res.partner) Course batch Name, Course Fee,

Upon pressing Save, the registration should be saved and a new invoice should be generated for that student with the amount of the Course Fee above.

I know how to create the registration form and how to inherit from res.partner, I just want to know how to generate an invoice using the Course Fee input.

Your help is appreciated.