How to set an Cisco VOIP Network

Hello again to all. Once again I am seeking your help. I am a up and coming Net Admin recently given the task to set up an Cisco VOIP network. Currently all me have is 10 2900 switches, 2 3500 POE switches and couple routers, PIX and content engine. Where do I start. Please give some tips and pitfalls to avoid. Plan on using the Cisco 7960G phones ( no choice there ). Thanks Jerry