Luckliy, he's talking complete tosh. In actual fact you NEED to delete the pics from your memory card after uploading them, otherwise the next time you connect your iPod next you'll upload them again and you'll have 2 copies of them.
This isn't correct either.
You can view them on your iPod when uploaded, but what you cannot do is output the image to a TV as you can with your "regular" photo library on your iPod. The photos don't appear in your library on your iPod menu, but in "Photo Import", which is a menu option which appears after you have connected to a camera and uploaded some photos.
If you want to output to a TV you need to put them onto your computer furst and then synch with you iPod as ususal.
Below are some shots of my iPod having uploaded a pic to it this morning, showing the way it will look.
The other thing to check is that you've got a compatitible iPod as some of the older ones won't work with it. Some pointers here -
Apple Camera Connector page iPod accesories page
Hope it helps.