well if your doing any wiring inside walls etc you may want some wall jacks, you may also wish to invest in some conduit for running the cable along the wall. It usually comes with an adhesive strip on the back and simply clicks shut around the cable, it gives a really profesional look.

Then again you may not need these things if you cabling will end up in like a server room or other out of the way areas.

I think you can get a fair share of the stuff you need at www.Onvia.com, however if you can find it localy it'll probly be cheaper.