Go to our reference section (the first set of forums at the top of the main page and read over some of the topics there). Search Google for stuff like "basics of modifying Hondas" and "good basic modifications for Hondas". Go to Barnes & Noble or Borders and look in the automotive section. They have books that specifically cover modifying Hondas, everything from very basic mods like intake and exhaust to complicated stuff like engine swaps and turbos...
