Oracle parameter form for reports - forms and reports 10g

I have a params form where the user defines report parameters for the report registered. This forms works fine.
Now I need to design a params report form where the user when clicks on the report in the oracle application menu, a param form comes up and displays fields where values can be entered for the parameters defined already in params form. Then te user has to run the report. Report pulls data for the parameter values entered. How to design this? Any design help or document . I have database table that stores param_name, data-type (varchar2,date,number) initial_value( eg for start_date - select trunc(sysdate) from dual)
Now my problem how to design the params report form. I am attaching a screen print to show hopw parameters are entered when registering. Now I need to create a form to run report based on these parameters. How to design
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