welcome mate, as for moddifying it depends what you want, subtle moddification or in your face moddification, I agree with Martyn your first step should be a damned good service next depends on wether you want to improve speed or improve look, Modding is a personal thing but you cant go wrong with a nice pair of 18" wheels and a nice shiney exhaust, Think shagmonkey still has some sill covers left they look soooooooooo much better than the standard ford ones.
Remember have a plan of what you want your car to finish up like and try and stick to it, there are loads of modds you can do but they dont all work well together.