Start simple and small, and go where the data takes you. PPC is an iterative activity. The data determines next steps. If you started with one campaign composed of five ad groups, expand the ad groups that show click and conversion activity and leave the others for later. Over time, advance to complex and large. Expand kw’s, ad groups and campaigns based on what has worked. In terms of time and effort, feed the winners and starve the losers. This approach will help you best focus your time and make you (or your client) more money!