1st off welcome to the wonderful addiction of Isuzu modification. I personnally believe this forum is the best around <img src="/forums/images/graemlins/kewl.gif" alt="" />
Your best bet for info is try first try the search function or browse through past topics. Type Lift kit, rack, lights etc in the search bar and a wealth of info will be at your fingertips. This will give you a good general idea about your subjects and the members will be more than happy to answer any questions.

Some cool places to look for Isuzu stuff:
independent 4x4
Calmini Manufacturing
darlington-offroad

And a cool collection of how to articles at:
www.isuzu-suvs.com how to index

Warning <img src="/forums/images/graemlins/evil.gif" alt="" /> I got my 98 trooper at the beginning of the year and have no end to the potential uprades and mods to perform.