I was wondering if someone could help a newb to SFDC come up with the code for an apex trigger.

Here's the scenario:

I have a custom object called payments (Payments__c) - a child object  of opportunities - and I would like a payment record to be created after a new opportunity record is created, but only if a checkbox is checked (Create_New_Payment__c).

There are a few fields on the new payment record that need to be pre-populated:

1. The opportunity field (obviously)
2. Payment amount (Amount__c) should equal the amount of the opportunity (the payment amount field is not a formula field and can't be, but maybe this can be accomplished with workflow - if Create_New_Payment__c is true, payment amount equals opportunity amount??)
3. Paid__c checkbox equals true

So is this possible to do?

Thanks for any help.