Resume ?: I’ve been the IT guy for years, just never as my primary job

I’m looking to get into IT work fulltime, network admin position, computer setup, something like that. I’ve been doing this sort of work for about 12 years now, just never as my primary job focus. My main job as been doing mechanical design/CAD work, but the field is slow and I’ve moving to Eugene, Oregon which as two designer postions avalible, but as various IT/Computer tech postions. I need to fix up my resume to highlight my computer skills so employers will take notice. Any suggestions? Thanks