Will this lense, AF NIKKOR 28mm f/2.8D, fit a nikonD3000?

I'm not really sure if any of the nikon lenses will just fit any nikon really.

Added (1). Oh and a good tripod also.

Maybe

It will fit, but it won't autofocus. You can change aperture, and use metering. You need a D90 to be able to autofocus.

Yes, it will fit but it will not auto focus unless it is an AFs or AFi lens. Since the D3000 does not have a built in focus motor you need a lens that does. The D90 and above have a built in focus motor.

As far as a tripod goes look for something that can hold the heaviest lens you have or plan to purchase in the future. It is always good to go a little over. Plan on spending $100-$300 on a good one. There really isn't much need to go over that price.

Some good brands are Manfrotto, Bogen, Tiltall, Gitzo.