i was wondering if, one can use, universal remote control to click the photograph. What would be the code for it?
I don't know the answer to your question, but the ML-L3 remote designed for the D80 (and a bunch of other cameras) is selling for US$16.95 at b&h. That's probably your best bet.

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I need to buy a nikon camera but I dont know what lens to choose
The AF Micro-NIKKOR 60mm f/2.8D focuses down to 8 inches and provides 1:1 magnification. This will be an equivalent of 90 mm so you will really be close up to anything that you are photographing.
http://www.nikonusa.com/pdf/manuals/lenses/AF/60mmf2.8AF-S.pdf
You can also try the 105mm [...]

I am buying a Nikon D80 for my husband to use for a photography course. What lens would be best for general use and portraits?
The ultimate general purpose lens is the 18-200mm VR. It covers a wide range, from wide angle, to telephoto. The VR or vibration reduction is very effective, too.
For portrait work, [...]

I have a Nikon D80 camera. Is the new SB-900 flash fully compatible with the D80, or will I get only limited functionality from the SB-900?
Yes you can use the SB-900 fully with the D80 It will support TTL , iTTL, iTTL Balanced fill ligh functiions and the creative lighting system set up. So [...]