Welcome
First off, I'm a Canon guy, so I dint' know much about your Nikon gear. The N80 is supposedly a good camera. Great for beginners or even pros but not a top of the line body.
A good first (or second) lens would be a fast prime lens. Something like a 50mm F/1.8 They are usually very sharp, inexpensive and much better for low light situations.
T-max are good films, I like Ilford Delta too. Do you develop yourself? If not you can buy b&w C41 film that can be processed at any lab without having to send it out.
Polarizing filters are good for a few things...they reduce reflection and glare and can help to get more saturated colors. A UV filter is good to keep on the lens for protection. For b&w photography, colored filters can be useful to bring out contrast...a red/yellow filter will make a blue sky look dark...to contrast with white clouds.
Equipment for a beginner...a tripod would be one of the first things to get. You want sturdy and light but will have to pay a lot for one that is both. A cable release or remote control is helpful...if the camera is not in your hands when you shoot, the pictures will be sharper.
Without knowing what kind of pictures you want to take, it's hard to make suggestions. At every level of photography, you have to make decisions about what to bring and what to leave at home. The more gear you have, the harder it is.
As a beginner, I'd suggest that you not go overboard with the accessories. Just get some film and go out and shoot...you will find out what you need and what you want to try. Find out what your camera can do and then start to use the accessories.
Most of all, have fun.