read the first gen crx FAQ in the refrence section of this site...
its all about cheap upgrades to a crx, but most of the shit will probably apply to a civic...
one recommendation... definately do the dohc d series motor swap if you can find a wrecked 86-87 integra with good motor and 5 speed... you will be more than happy with it... trust me...
as far as body kit...
you;re shit out of luck...
try and find a lip kit in a junkyard or something...
anything else will either fit horribly, or not at all...
and if you are planning to make this a major project i would strongly advise upgrading to a newer chassis...
these are fun little cars, but don't get carried away with the money you put into it...
also check the floors etc for rot issues before you even put a wrench on it...