first of all, welcome to NICO.
second, there is a search button. Use it to find whatever you need to know about your altima.
third, I think it's a waste of money to hid high beam.
fourth, here are a few of many useful links that will help to answer a few of your questions
HID Polls
zerothread/319259 zerothread/318074
Fog light questions
zerothread?id=293345 zerothread?id=312723
Enjoy reading