Read these then ask questions All of the info you need can be found here I promise!
First Modifications - what to do and not to do
"The BIG BOV thread" (Where all bov question threads get merged)
Yes, you need an EM for engine mods
As for exterior stuff...have a look through this thread: ...:::[[[MEMBER CAR GALLERY]]]:::.... Find something you like then make your car look how you want. There are generally no rules when it comes to appearance. Not everyone will like what you do but that shouldn't matter.