The first thing to do is to determine if you what business you are actually designing it for. If its for a Graphic Designing firm....bold designs would do greatly. Along with a well thought out layout option which includes a lot of bold concepts. Your logo also must be top of the line.

If you are designing for some kind of "Corporate Service" such as a lawyer/ Accountant etc..simple less bolder designs will do fine in this. You should try to have the most 2 colours. The only thing outstanding in it should be the contact info and name.

That's all it is to it. :-)