I have downloaded some tv shows and podcasts right now I m trough with them .How do I delete them as I don't have a Mac book nor another computer to connect to hence I want them deleted

If you press and hold the tv show (from the thumbnail screen) for a couple of seconds or so, then you should then get an 'x' in its top left corner - I assume that touching that then deletes it (I havn't tried pressing it on my iPad as I don't want to delete any of mine).

For podcasts in the iPod app, on the podcast list screen swipe across the name of one that you want to delete and you should then get a Delete button to its right.