Also, you need to bear in mind the 'crop factor' of enter~mid level dSLR's. On all Nikon (except high end full frame range) you'll need to muliply the focal length of the lens by 1.5 so if you have an 18~55mm lens, you actually are using a 27~82.5mm lens. This is OK if you want to zoom in on your subject but not if you want to shoot wide angle landscapes,, for this you'll need a DX lens which is made for DSLR's.
For a macro lens (which means you are shooting a subject at a ratio of 1:1) there are a quite a lot of lenses available. Some zoom lenses have a macro focusing on them or you can buy a fixed focal length lens such as 60mm, 105mm or 180mm. With a 60mm, you'll need to be closer to the subject whilst a with a 180mm, you can be further away. So if you are shooting hand tied flies at home, mounted in a vice, a 60mm would be fine but if you are shooting insects on flowers, I think you'll need either a 105 or 180mm. Don't forget about the crop factor though! 60mm becomes a 90mm, 105mm becomes a 157.5mm and a 180mm becomes a 270mm. You'll also need a good tripod or monopod to keep the camera steady for most macro work.
As the others have mentioned, D60 is a great camera.
Have a look on here for more in depth help and advice:
http://www.dpreview.com/
HTH!
FbS