Can any one help me out on how to theme a view.
For each view created i want to have different templates.
Theming views can be somewhat tricky, depending on the kind of views you have created and the changes you need to make. Check out this introduction for Views 2, and make sure to install the Advanced Help module to get at the views2 documentation from the views module itself (there will be a link to the documentation on your views overview and edit pages, once you activated the Advanced Help module).
You can also find some questions/answers here on SO (e.g. Drupal 6: How to quickly theme a view?), if you search a bit.