A basic UV or "Haze" filter won't noticeably affect your pictures. Do some Google searching on filters and you can find tons of info. I think most members of this forum swear by Cokin filters, but for simple lens protection I use a cheapo Quantaray UV filter purchased from Ritz Camera at the local mall. A filter that WILL affect your exposure will have a numerical rating to help you set an offsetting exposure adjustment.
Here's your lens adapter direct from Kodak... or you can get this stuff from BH Photo: