SAP SCRIPTS

Hi All

I' new in ABAP Programming . I'm working on CASH JOURNAL FORM ,I have designed the form as per the client request .But i'm not able to Proceed further ,can anyone explain me what i should do next,To the print program i have copied standard program (RFKORD80)to zprog(zrfkord80) but how can i trigger my form to the standard program.

I will be thankfull if anyone can help me

Cheers,

Mujeeb