Dynamic Programming Problem

I want to develop a small application in ABAP WebDynpro like------

1>it takes the name of a DDIC table as input and then displays the data as a tabular form

2>If I modify the data in the displayed table and then press the save button the data will be updated and saved in the DDIC transparent table

I have reached upto 1 but can't proceed towards 2 . Can anybody help me?