What you will need for this tutorial
Q3Map2 (This will be used for compiling your bsp)
the bsp you wish to modify (duh!)
notepad++ (You will need some sort of text editing program for doing the actual modding. You could use notepad but it sucks)
Jedi academy
In order to get q3map2 the easiest way is to install gtkradiant then go to the install folder and copy the q3map2 exe file and all the dll's to the folder where you will be working.
You can get