What kind of filters are best for nikon d7000?

May i ask for any advice. I'm planning to buy a 50mm 1.8g lens for my nikon d7000 and i also want to purchase a filter.
1.Is 50mm 1.8g better than 1.8d?
2. If i were to buy 3pieces of filter, what would you recommend?

A UV (also called skylight) helps protect the lens' glass. A polarizing filter helps make fluffy white clouds stand out and can help reduce reflection on water or glass. On rare occasions I use a graduated tobacco to help color up evening sky, but that's about it. Most digital cameras have a fluorescent setting, eliminating the need for a separate filter, although it may be quicker to screw the filter on and then remove it than to go through all the menu stuff. I have a Nikon and that's not really the case, but just a thought.

1. The 50mm and 35mm lenses have different uses. One lens may be better at a specific type of photography, but there's no "better" overall

I.E, you would be a complete idiot to do portraits with a Zeiss APO sonar 1700mm f/4 lens

likewise, you would be a complete idiot to take action shots of your favorite sports star with a Tokina 11-16mm from the nosebleed section

what it comes down to is what you want to shoot

on your D7000, the 35mm lens will mimic more or less the same view of what you see with your eyes. The 50mm will be slightly telephoto, perfect for portraits and people shots

2. I buy UV filters just to protect the front element of my lens from dust, water, and possible little dings. If you break the UV filter, you just get a new one. If you bust the lens, you need a new lens, which is many times more expensive

I use B&W and Hoya brand filters.

You have to understand what a filter does before you buy and use it. Basically a filter blocks out light. It will now depend on how and how much of the light you want blocked to get your desired photograph.

For (physical) protection, use a UV or skylight filter as it almost doesn't affect picture quality.