how to show data

Question

How can we show data according to category selected from combobox.

 

For eg If we have displayed all type of shayari(valentine,children,religius  etc) in a combobox. Now if select valentine than all shayari related to valentine shayari should be shown on page (per page 3 records and other next page only of valentine shayri). If we select other shayari than same should be done. Also what should be default

value on that page instead of blank page on page loading.